Why am I getting error "Vectors must be the same length" although they are of same length?

I am trying to plot a X,Y graph. I am getting an error "Vectors must be the same length", although I see in the workspace that they are of the same length. It is working for most of the trials in the table, but throwing an error for some entries. What could be the problem? I have attached the table. Here is my code for the plot.

plot(subject_data.xcoordinates2{subject_data.trialname == 'Trial40'}, ...
    subject_data.ycoordinates2{subject_data.trialname == 'Trial40'});

The error is as follows.

Error using plot
Vectors must be the same length.

Error in maze_outlier (line 137)
plot(subject_data.xcoordinates2{subject_data.trialname == 'Trial40'}, ...

[Torsten]

Before the plot command, insert

size(subject_data.xcoordinates2{subject_data.trialname == 'Trial40'})
size(subject_data.ycoordinates2{subject_data.trialname == 'Trial40'})

What do you get as output ?

[Struggling in MATLAB]

It said too many input arguments. Anyway, I got help to identify the problem. Thanks for your comment.

Answer 1

[Voss]

load('subject_data.mat')
disp(subject_data)

    subjectid    mazenumber    feeder    trialname       date        playstarttrialtone    presentcost    coordinatetimes2    xcoordinates2     ycoordinates2       truextail         trueytail         truexnose         trueynose       truedirection 
    _________    __________    ______    _________    ___________    __________________    ___________    ________________    ______________    ______________    ______________    ______________    ______________    ______________    ______________

    "renata"       maze 4      {[3]}      Trial40     16-May-2022         {[  2]}          {[2.5000]}      {281×1 double}     {281×1 double}    {281×1 double}    {281×1 double}    {281×1 double}    {281×1 double}    {281×1 double}    {281×1 double}
    "renata"       maze 4      {[3]}      Trial19     16-May-2022         {[  2]}          {[2.5000]}      {270×1 double}     {270×1 double}    {270×1 double}    {270×1 double}    {270×1 double}    {270×1 double}    {270×1 double}    {270×1 double}
    "renata"       maze 4      {[4]}      Trial8      16-May-2022         {[  2]}          {[2.5000]}      {271×1 double}     {271×1 double}    {271×1 double}    {271×1 double}    {271×1 double}    {271×1 double}    {271×1 double}    {271×1 double}
    "renata"       maze 4      {[4]}      Trial13     16-May-2022         {[  2]}          {[2.5000]}      {271×1 double}     {271×1 double}    {271×1 double}    {271×1 double}    {271×1 double}    {271×1 double}    {271×1 double}    {271×1 double}
    "renata"       maze 4      {[2]}      Trial1      16-May-2022         {[  2]}          {[2.5000]}      {291×1 double}     {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}
    "renata"       maze 4      {[2]}      Trial5      16-May-2022         {[  2]}          {[2.5000]}      {300×1 double}     {300×1 double}    {300×1 double}    {300×1 double}    {300×1 double}    {300×1 double}    {300×1 double}    {300×1 double}
    "renata"       maze 4      {[3]}      Trial2      16-May-2022         {[  2]}          {[2.5000]}      {291×1 double}     {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}
    "renata"       maze 4      {[1]}      Trial3      16-May-2022         {[  2]}          {[2.5000]}      {291×1 double}     {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}
    "renata"       maze 4      {[3]}      Trial4      16-May-2022         {[  2]}          {[2.5000]}      {270×1 double}     {270×1 double}    {270×1 double}    {270×1 double}    {270×1 double}    {270×1 double}    {270×1 double}    {270×1 double}
    "renata"       maze 4      {[1]}      Trial15     16-May-2022         {[  2]}          {[2.5000]}      {291×1 double}     {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}
    "renata"       maze 4      {[4]}      Trial6      16-May-2022         {[  2]}          {[2.5000]}      {290×1 double}     {290×1 double}    {290×1 double}    {290×1 double}    {290×1 double}    {290×1 double}    {290×1 double}    {290×1 double}
    "renata"       maze 4      {[1]}      Trial7      16-May-2022         {[  2]}          {[2.5000]}      {291×1 double}     {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}
    "renata"       maze 4      {[2]}      Trial9      16-May-2022         {[  2]}          {[2.5000]}      {280×1 double}     {280×1 double}    {280×1 double}    {280×1 double}    {280×1 double}    {280×1 double}    {280×1 double}    {280×1 double}
    "renata"       maze 4      {[2]}      Trial10     16-May-2022         {[  2]}          {[2.5000]}      {291×1 double}     {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}
    "renata"       maze 4      {[3]}      Trial14     16-May-2022         {[  2]}          {[2.5000]}      {271×1 double}     {271×1 double}    {271×1 double}    {271×1 double}    {271×1 double}    {271×1 double}    {271×1 double}    {271×1 double}
    "renata"       maze 4      {[3]}      Trial11     16-May-2022         {[  2]}          {[2.5000]}      {280×1 double}     {280×1 double}    {280×1 double}    {280×1 double}    {280×1 double}    {280×1 double}    {280×1 double}    {280×1 double}
    "renata"       maze 4      {[4]}      Trial12     16-May-2022         {[  2]}          {[2.5000]}      {272×1 double}     {272×1 double}    {272×1 double}    {272×1 double}    {272×1 double}    {272×1 double}    {272×1 double}    {272×1 double}
    "renata"       maze 4      {[1]}      Trial16     16-May-2022         {[  2]}          {[2.5000]}      {281×1 double}     {281×1 double}    {281×1 double}    {281×1 double}    {281×1 double}    {281×1 double}    {281×1 double}    {281×1 double}
    "renata"       maze 4      {[2]}      Trial17     16-May-2022         {[  2]}          {[2.5000]}      {300×1 double}     {300×1 double}    {300×1 double}    {300×1 double}    {300×1 double}    {300×1 double}    {300×1 double}    {300×1 double}
    "renata"       maze 4      {[4]}      Trial18     16-May-2022         {[  2]}          {[2.5000]}      {271×1 double}     {271×1 double}    {271×1 double}    {271×1 double}    {271×1 double}    {271×1 double}    {271×1 double}    {271×1 double}
    "renata"       maze 4      {[4]}      Trial20     16-May-2022         {[  2]}          {[2.5000]}      {280×1 double}     {280×1 double}    {280×1 double}    {280×1 double}    {280×1 double}    {280×1 double}    {280×1 double}    {280×1 double}
    "renata"       maze 4      {[1]}      Trial21     16-May-2022         {[  2]}          {[2.5000]}      {281×1 double}     {281×1 double}    {281×1 double}    {281×1 double}    {281×1 double}    {281×1 double}    {281×1 double}    {281×1 double}
    "renata"       maze 4      {[4]}      Trial34     16-May-2022         {[  2]}          {[2.5000]}      {270×1 double}     {270×1 double}    {270×1 double}    {270×1 double}    {270×1 double}    {270×1 double}    {270×1 double}    {270×1 double}
    "renata"       maze 4      {[2]}      Trial22     16-May-2022         {[  2]}          {[2.5000]}      {281×1 double}     {281×1 double}    {281×1 double}    {281×1 double}    {281×1 double}    {281×1 double}    {281×1 double}    {281×1 double}
    "renata"       maze 4      {[2]}      Trial36     16-May-2022         {[  2]}          {[2.5000]}      {290×1 double}     {290×1 double}    {290×1 double}    {290×1 double}    {290×1 double}    {290×1 double}    {290×1 double}    {290×1 double}
    "renata"       maze 4      {[3]}      Trial23     16-May-2022         {[  2]}          {[2.5000]}      {271×1 double}     {271×1 double}    {271×1 double}    {271×1 double}    {271×1 double}    {271×1 double}    {271×1 double}    {271×1 double}
    "renata"       maze 4      {[2]}      Trial24     16-May-2022         {[  2]}          {[2.5000]}      {270×1 double}     {270×1 double}    {270×1 double}    {270×1 double}    {270×1 double}    {270×1 double}    {270×1 double}    {270×1 double}
    "renata"       maze 4      {[4]}      Trial25     16-May-2022         {[  2]}          {[2.5000]}      {281×1 double}     {281×1 double}    {281×1 double}    {281×1 double}    {281×1 double}    {281×1 double}    {281×1 double}    {281×1 double}
    "renata"       maze 4      {[4]}      Trial31     16-May-2022         {[  2]}          {[2.5000]}      {271×1 double}     {271×1 double}    {271×1 double}    {271×1 double}    {271×1 double}    {271×1 double}    {271×1 double}    {271×1 double}
    "renata"       maze 4      {[1]}      Trial26     16-May-2022         {[  2]}          {[2.5000]}      {281×1 double}     {281×1 double}    {281×1 double}    {281×1 double}    {281×1 double}    {281×1 double}    {281×1 double}    {281×1 double}
    "renata"       maze 4      {[2]}      Trial27     16-May-2022         {[  2]}          {[2.5000]}      {271×1 double}     {271×1 double}    {271×1 double}    {271×1 double}    {271×1 double}    {271×1 double}    {271×1 double}    {271×1 double}
    "renata"       maze 4      {[3]}      Trial28     16-May-2022         {[  2]}          {[2.5000]}      {280×1 double}     {280×1 double}    {280×1 double}    {280×1 double}    {280×1 double}    {280×1 double}    {280×1 double}    {280×1 double}
    "renata"       maze 4      {[3]}      Trial29     16-May-2022         {[  2]}          {[2.5000]}      {270×1 double}     {270×1 double}    {270×1 double}    {270×1 double}    {270×1 double}    {270×1 double}    {270×1 double}    {270×1 double}
    "renata"       maze 4      {[4]}      Trial30     16-May-2022         {[  2]}          {[2.5000]}      {271×1 double}     {271×1 double}    {271×1 double}    {271×1 double}    {271×1 double}    {271×1 double}    {271×1 double}    {271×1 double}
    "renata"       maze 4      {[1]}      Trial32     16-May-2022         {[  2]}          {[2.5000]}      {291×1 double}     {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}
    "renata"       maze 4      {[1]}      Trial33     16-May-2022         {[  2]}          {[2.5000]}      {291×1 double}     {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}
    "renata"       maze 4      {[1]}      Trial35     16-May-2022         {[  2]}          {[2.5000]}      {283×1 double}     {283×1 double}    {283×1 double}    {283×1 double}    {283×1 double}    {283×1 double}    {283×1 double}    {283×1 double}
    "renata"       maze 4      {[2]}      Trial37     16-May-2022         {[  2]}          {[2.5000]}      {270×1 double}     {270×1 double}    {270×1 double}    {270×1 double}    {270×1 double}    {270×1 double}    {270×1 double}    {270×1 double}
    "renata"       maze 4      {[3]}      Trial38     16-May-2022         {[  2]}          {[2.5000]}      {271×1 double}     {271×1 double}    {271×1 double}    {271×1 double}    {271×1 double}    {271×1 double}    {271×1 double}    {271×1 double}
    "renata"       maze 4      {[1]}      Trial39     16-May-2022         {[  2]}          {[2.5000]}      {271×1 double}     {271×1 double}    {271×1 double}    {271×1 double}    {271×1 double}    {271×1 double}    {271×1 double}    {271×1 double}
    "renata"       maze 4      {[2]}      Trial1      16-May-2022         {[  2]}          {[2.5000]}      {301×1 double}     {301×1 double}    {301×1 double}    {301×1 double}    {301×1 double}    {301×1 double}    {301×1 double}    {301×1 double}
    "renata"       maze 4      {[3]}      Trial2      16-May-2022         {[  2]}          {[2.5000]}      {280×1 double}     {280×1 double}    {280×1 double}    {280×1 double}    {280×1 double}    {280×1 double}    {280×1 double}    {280×1 double}
    "renata"       maze 4      {[1]}      Trial3      16-May-2022         {[  2]}          {[2.5000]}      {291×1 double}     {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}
    "renata"       maze 4      {[3]}      Trial4      16-May-2022         {[  2]}          {[2.5000]}      {290×1 double}     {290×1 double}    {290×1 double}    {290×1 double}    {290×1 double}    {290×1 double}    {290×1 double}    {290×1 double}
    "renata"       maze 4      {[2]}      Trial5      16-May-2022         {[  2]}          {[2.5000]}      {606×1 double}     {606×1 double}    {606×1 double}    {606×1 double}    {606×1 double}    {606×1 double}    {606×1 double}    {606×1 double}
    "renata"       maze 4      {[4]}      Trial6      16-May-2022         {[NaN]}          {[   NaN]}      {606×1 double}     {606×1 double}    {606×1 double}    {606×1 double}    {606×1 double}    {606×1 double}    {606×1 double}    {606×1 double}
    "renata"       maze 4      {[1]}      Trial7      16-May-2022         {[  2]}          {[2.5000]}      {309×1 double}     {309×1 double}    {309×1 double}    {309×1 double}    {309×1 double}    {309×1 double}    {309×1 double}    {309×1 double}
    "renata"       maze 4      {[4]}      Trial8      16-May-2022         {[  2]}          {[2.5000]}      {272×1 double}     {272×1 double}    {272×1 double}    {272×1 double}    {272×1 double}    {272×1 double}    {272×1 double}    {272×1 double}
    "renata"       maze 4      {[2]}      Trial9      16-May-2022         {[  2]}          {[2.5000]}      {280×1 double}     {280×1 double}    {280×1 double}    {280×1 double}    {280×1 double}    {280×1 double}    {280×1 double}    {280×1 double}
    "renata"       maze 4      {[2]}      Trial10     16-May-2022         {[  2]}          {[2.5000]}      {291×1 double}     {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}
    "renata"       maze 4      {[1]}      Trial15     16-May-2022         {[  2]}          {[2.5000]}      {291×1 double}     {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}
    "renata"       maze 4      {[3]}      Trial11     16-May-2022         {[  2]}          {[2.5000]}      {290×1 double}     {290×1 double}    {290×1 double}    {290×1 double}    {290×1 double}    {290×1 double}    {290×1 double}    {290×1 double}
    "renata"       maze 4      {[4]}      Trial12     16-May-2022         {[  2]}          {[2.5000]}      {272×1 double}     {272×1 double}    {272×1 double}    {272×1 double}    {272×1 double}    {272×1 double}    {272×1 double}    {272×1 double}
    "renata"       maze 4      {[4]}      Trial13     16-May-2022         {[  2]}          {[2.5000]}      {270×1 double}     {270×1 double}    {270×1 double}    {270×1 double}    {270×1 double}    {270×1 double}    {270×1 double}    {270×1 double}
    "renata"       maze 4      {[3]}      Trial14     16-May-2022         {[  2]}          {[2.5000]}      {280×1 double}     {280×1 double}    {280×1 double}    {280×1 double}    {280×1 double}    {280×1 double}    {280×1 double}    {280×1 double}
    "renata"       maze 4      {[1]}      Trial16     16-May-2022         {[  2]}          {[2.5000]}      {290×1 double}     {290×1 double}    {290×1 double}    {290×1 double}    {290×1 double}    {290×1 double}    {290×1 double}    {290×1 double}
    "renata"       maze 4      {[2]}      Trial17     16-May-2022         {[  2]}          {[2.5000]}      {282×1 double}     {282×1 double}    {282×1 double}    {282×1 double}    {282×1 double}    {282×1 double}    {282×1 double}    {282×1 double}
    "renata"       maze 4      {[4]}      Trial18     16-May-2022         {[  2]}          {[2.5000]}      {291×1 double}     {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}
    "renata"       maze 4      {[3]}      Trial19     16-May-2022         {[  2]}          {[2.5000]}      {291×1 double}     {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}
    "renata"       maze 4      {[4]}      Trial20     16-May-2022         {[  2]}          {[2.5000]}      {271×1 double}     {271×1 double}    {271×1 double}    {271×1 double}    {271×1 double}    {271×1 double}    {271×1 double}    {271×1 double}
    "renata"       maze 4      {[1]}      Trial21     16-May-2022         {[  2]}          {[2.5000]}      {281×1 double}     {281×1 double}    {281×1 double}    {281×1 double}    {281×1 double}    {281×1 double}    {281×1 double}    {281×1 double}
    "renata"       maze 4      {[2]}      Trial22     16-May-2022         {[  2]}          {[2.5000]}      {291×1 double}     {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}
    "renata"       maze 4      {[3]}      Trial23     16-May-2022         {[  2]}          {[2.5000]}      {300×1 double}     {300×1 double}    {300×1 double}    {300×1 double}    {300×1 double}    {300×1 double}    {300×1 double}    {300×1 double}
    "renata"       maze 4      {[2]}      Trial24     16-May-2022         {[  2]}          {[2.5000]}      {291×1 double}     {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}
    "renata"       maze 4      {[4]}      Trial25     16-May-2022         {[  2]}          {[2.5000]}      {270×1 double}     {270×1 double}    {270×1 double}    {270×1 double}    {270×1 double}    {270×1 double}    {270×1 double}    {270×1 double}
    "renata"       maze 4      {[1]}      Trial26     16-May-2022         {[  2]}          {[2.5000]}      {281×1 double}     {281×1 double}    {281×1 double}    {281×1 double}    {281×1 double}    {281×1 double}    {281×1 double}    {281×1 double}
    "renata"       maze 4      {[2]}      Trial27     16-May-2022         {[  2]}          {[2.5000]}      {302×1 double}     {302×1 double}    {302×1 double}    {302×1 double}    {302×1 double}    {302×1 double}    {302×1 double}    {302×1 double}
    "renata"       maze 4      {[3]}      Trial28     16-May-2022         {[  2]}          {[2.5000]}      {280×1 double}     {280×1 double}    {280×1 double}    {280×1 double}    {280×1 double}    {280×1 double}    {280×1 double}    {280×1 double}
    "renata"       maze 4      {[3]}      Trial29     16-May-2022         {[  2]}          {[2.5000]}      {281×1 double}     {281×1 double}    {281×1 double}    {281×1 double}    {281×1 double}    {281×1 double}    {281×1 double}    {281×1 double}
    "renata"       maze 4      {[4]}      Trial30     16-May-2022         {[  2]}          {[2.5000]}      {281×1 double}     {281×1 double}    {281×1 double}    {281×1 double}    {281×1 double}    {281×1 double}    {281×1 double}    {281×1 double}
    "renata"       maze 4      {[4]}      Trial31     16-May-2022         {[  2]}          {[2.5000]}      {272×1 double}     {272×1 double}    {272×1 double}    {272×1 double}    {272×1 double}    {272×1 double}    {272×1 double}    {272×1 double}
    "renata"       maze 4      {[1]}      Trial32     16-May-2022         {[  2]}          {[2.5000]}      {291×1 double}     {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}
    "renata"       maze 4      {[1]}      Trial33     16-May-2022         {[  2]}          {[2.5000]}      {291×1 double}     {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}
    "renata"       maze 4      {[4]}      Trial34     16-May-2022         {[  2]}          {[2.5000]}      {270×1 double}     {270×1 double}    {270×1 double}    {270×1 double}    {270×1 double}    {270×1 double}    {270×1 double}    {270×1 double}
    "renata"       maze 4      {[1]}      Trial35     16-May-2022         {[  2]}          {[2.5000]}      {281×1 double}     {281×1 double}    {281×1 double}    {281×1 double}    {281×1 double}    {281×1 double}    {281×1 double}    {281×1 double}
    "renata"       maze 4      {[2]}      Trial36     16-May-2022         {[  2]}          {[2.5000]}      {281×1 double}     {281×1 double}    {281×1 double}    {281×1 double}    {281×1 double}    {281×1 double}    {281×1 double}    {281×1 double}
    "renata"       maze 4      {[2]}      Trial37     16-May-2022         {[  2]}          {[2.5000]}      {281×1 double}     {281×1 double}    {281×1 double}    {281×1 double}    {281×1 double}    {281×1 double}    {281×1 double}    {281×1 double}
    "renata"       maze 4      {[3]}      Trial38     16-May-2022         {[  2]}          {[2.5000]}      {280×1 double}     {280×1 double}    {280×1 double}    {280×1 double}    {280×1 double}    {280×1 double}    {280×1 double}    {280×1 double}
    "renata"       maze 4      {[1]}      Trial39     16-May-2022         {[  2]}          {[2.5000]}      {291×1 double}     {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}    {291×1 double}
    "renata"       maze 4      {[3]}      Trial40     16-May-2022         {[  2]}          {[2.5000]}      {270×1 double}     {270×1 double}    {270×1 double}    {270×1 double}    {270×1 double}    {270×1 double}    {270×1 double}    {270×1 double}

% There are 2 Trial40's in the table:
find(subject_data.trialname == 'Trial40')

ans = 2×1

1 80

% To plot both, you can collect the x- and y-coordinates in a cell array like this:
args = { ...
    subject_data.xcoordinates2{subject_data.trialname == 'Trial40'} ...
    subject_data.ycoordinates2{subject_data.trialname == 'Trial40'}}

args = 1×4 cell array
    {281×1 double}    {270×1 double}    {281×1 double}    {270×1 double}

% but they are in order [x1 x2 y1 y2], so you have to make them [x1 y1 x2 y2]:
args = args([1:2:end 2:2:end])

args = 1×4 cell array
    {281×1 double}    {281×1 double}    {270×1 double}    {270×1 double}

% and then send them to plot() in that order:
plot(args{:});

[Struggling in MATLAB]

Thanks for looking at the data and your insight. I had no idea that there was dulicate data. However, I believe this occurance is rare. I want to bypass it by just accessing the 1st occurance of 'Trial40'. (I know there will be error, but I have loads of data. So it should not affect much) How do I plot just the first one?

[Struggling in MATLAB]

Nevermind, I can use @David Hill 's response for the workaround. Thank you!

Answer 2

[David Hill]

You have two 'Trial40'

plot(subject_data.xcoordinates2{find(subject_data.trialname == 'Trial40',1)}, ...
    subject_data.ycoordinates2{find(subject_data.trialname == 'Trial40',1)});

plot(subject_data.xcoordinates2{find(subject_data.trialname == 'Trial40',1,'last')}, ...
    subject_data.ycoordinates2{find(subject_data.trialname == 'Trial40',1,'last')});

[Struggling in MATLAB]

Thanks for looking at the data and your insight. I had no idea that there was dulicate data. This solution works for me.

[Struggling in MATLAB]

Again, sorry I couldn't accept both answers. :(