Error using plot--vectors must be the same lengths?

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Kelsey
Kelsey 2014 年 4 月 22 日
コメント済み: the cyclist 2014 年 4 月 22 日
Why am I getting the error message, "Error using plot Vectors must be the same lengths"? This code worked fine before I added a few more data points… Thank you in advance! :)
% Load Horiz.Disp. Vert.Disp.
A=[0.000000E+0 0.000000E+0 0.000000E+0
3.735352E-1 -5.517578E-3 -3.906250E-4
5.489746E-1 -1.005859E-2 -9.765625E-5
5.575684E-1 -1.054687E-2 7.812500E-4
5.644531E-1 -1.113281E-2 1.708984E-3
6.968750E-1 -1.381836E-2 2.734375E-3
9.428223E-1 -1.835937E-2 2.734375E-3
1.182324E+0 -2.192383E-2 4.394531E-3
1.416846E+0 -2.827148E-2 4.150391E-3
1.622949E+0 -3.500977E-2 3.906250E-3
1.815039E+0 -4.213867E-2 5.126953E-3
2.005273E+0 -5.039062E-2 5.664063E-3
2.201904E+0 -5.966797E-2 5.908203E-3
2.406152E+0 -7.031250E-2 5.859375E-3
2.622949E+0 -8.139648E-2 6.005859E-3
2.858691E+0 -9.526367E-2 5.957031E-3
3.104980E+0 -1.117676E-1 6.494141E-3
3.371484E+0 -1.316406E-1 7.226563E-3
3.663330E+0 -1.607422E-1 6.787109E-3
3.968652E+0 -1.978027E-1 7.666016E-3
4.311963E+0 -2.585937E-1 7.226563E-3
4.648584E+0 -3.464844E-1 8.251953E-3
4.933789E+0 -4.650879E-1 8.984375E-3
5.160156E+0 -6.127930E-1 9.472656E-3
5.314648E+0 -7.623535E-1 9.423828E-3
5.421826E+0 -9.119141E-1 9.814453E-3
5.497217E+0 -1.054199E+0 1.054688E-2
5.550635E+0 -1.184229E+0 1.079102E-2
5.592627E+0 -1.308594E+0 1.127930E-2
5.625293E+0 -1.420264E+0 1.191406E-2
5.677246E+0 -1.631250E+0 1.269531E-2
5.710596E+0 -1.820898E+0 1.333008E-2
5.735498E+0 -1.994336E+0 1.420898E-2
5.754199E+0 -2.154346E+0 1.552734E-2
5.777881E+0 -2.449365E+0 1.650391E-2
5.781934E+0 -2.584668E+0 1.728516E-2
5.781396E+0 -2.712500E+0 1.796875E-2
5.778418E+0 -2.836328E+0 1.948242E-2
5.776172E+0 -2.897314E+0 2.011719E-2
5.765283E+0 -3.072803E+0 2.109375E-2
5.759521E+0 -3.127002E+0 2.207031E-2
5.754980E+0 -3.183545E+0 2.304688E-2
5.733252E+0 -3.396484E+0 2.456055E-2
5.717334E+0 -3.498437E+0 2.558594E-2
5.684521E+0 -3.697021E+0 2.705078E-2
5.664746E+0 -3.790869E+0 2.783203E-2
5.633740E+0 -3.931055E+0 2.861328E-2
5.621533E+0 -3.974951E+0 2.934570E-2
5.598584E+0 -4.064502E+0 3.007813E-2
5.585693E+0 -4.108057E+0 3.081055E-2
5.573096E+0 -4.152197E+0 3.159180E-2
5.535010E+0 -4.279150E+0 3.247070E-2];
load=(A(:,1)).*100;
HorizDisp=abs((A(:,2)).*0.19574);
VertDisp=abs((A(:,3)).*1.724);
l=length(load);
yield=40000; %yield stress = 40 ksi
b=.125; %b = t = thickness of rod
h=1; %h = w = width of rod
L=9.875; %L = length of rod (subtracted out 2 in from 11.875)
E=10000000; %elastic modulus of Al 6061-T6
I=h*(b^3)/12; %Moment of Intertia
P=E*I*4*pi*pi/(L*L); %Buckling (or "critical") Load
disp(P) %Display value of Buckling Load
for n=1:l
loadnorm(n)=load(n)/P; %Normalize applied load by dividing by P
end
plot(VertDisp,loadnorm);
  1 件のコメント
the cyclist
the cyclist 2014 年 4 月 22 日
Side note: You should avoid naming a variable "load", because that is a MATLAB keyword.
[Not related to your present difficulty, most likely, but just good programming practice.]

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回答 (2 件)

the cyclist
the cyclist 2014 年 4 月 22 日
This code ran to completion for me.
  1 件のコメント
Kelsey
Kelsey 2014 年 4 月 22 日
So you got the plot out?? I wonder why I'm not getting it… :(

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Joseph Cheng
Joseph Cheng 2014 年 4 月 22 日
Plotted with mine as well. Kelsey can you tell us what dimensions (mxn) VertDisp and loadnorm are that you have in the work space?
Have you attempted to clear the workspace. Perhaps in your trouble shooting a dimension in either variable got screwed up.
  2 件のコメント
Kelsey
Kelsey 2014 年 4 月 22 日
They're all 52x1 matrices (vectors)! I removed the for loop, and now it works. How do I clear the workspace?
Thank you for your help!
the cyclist
the cyclist 2014 年 4 月 22 日
Type "clear" at the command prompt.

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