Matrix dimensions must agree

%%ARO 3220L Exp 7 Script

%%read dat in
% time=Kd02.eTime;
% CommPos=Kd02.CommandedPo;
% OutPos=Kd02.sEncoder1Pos;
% CommandedCounts = 1200;

time=plot1.eTime;
CommPos=plot1.CommandedPo;
OutPos=plot1.sEncoder1Pos;
CommandedCounts = 1200;

n=length(time);

%Find crossing points for Commanded and Response
%Signal crossing from Positive to negative assigned true or '1'
CommCrossIndexAll = and((CommPos > 0), not(circshift((CommPos > 0), 1)));  CommCrossIndexAll(1) = 0;
OutCrossIndexAll = and((OutPos > 0), not(circshift((OutPos > 0), 1)));  OutCrossIndexAll(1) = 0;

%Collects the index values of the crossing points
CrossIndex=find(OutCrossIndexAll);

%Collects the times of the crossing points
CommCrossTime = time(find(CommCrossIndexAll));
OutCrossTime = time(CrossIndex);

nComm = length(CommCrossTime);          %Number of crossings in command
nOut = length(OutCrossTime);            %Number of crossings in response
%Calculate lag times, two choices if crossing point count unequal
if nComm == nOut
    lagtime = OutCrossTime - CommCrossTime;
else
lagtime = OutCrossTime - CommCrossTime(1:nComm-1); %ERROR IS IN THIS LINE <-----------------------------------------------
end

for i=1:nOut-1
    ampOut(i) =max(OutPos(CrossIndex(i):CrossIndex(i+1)))...
    -min(OutPos(CrossIndex(i):CrossIndex(i+1)));        %Calculate response amplitudes
    CommCycleTime(i)=OutCrossTime(i+1)-OutCrossTime(i); %Calculate Cycle time
end

CommFreq = CommCycleTime.^-1;               %Calculate Frequency from Cycle time

magDb=20*log10(ampOut/CommandedCounts);     %Calculate Bode Magnitude Response

%Create plots
subplot(2,1,1)
plot(time,CommPos,time,OutPos)
title('Control Surface Response Pd = 0.004')
xlabel('Time (s)')
ylabel('Counts')

subplot(2,1,2)
plot(CommFreq,magDb)
title('Bode Magnitude')
xlabel('Frequency (Hz)')
ylabel('MdB')

I get the error:

'Matrix dimensions must agree.

Error in ARO3220L_Exp7_script (line 34)

lagtime = OutCrossTime - CommCrossTime(1:nComm-1);'

Im not quite sure whats wrong with the code please help

Answer 1

[adeq123]

The length of the vectors mentioned in error does not match. You need trim the longer one to the size of shorter one.