# how to solve this error horzcat Dimensions of matrices being concatenated are not consistent?

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Miguel Minga on 7 Mar 2021
Commented: Miguel Minga on 7 Mar 2021
Hi all, how can i solve this error:
t=Tp';
dt =t(2)-t(1);
vdrift = filter(d,drift)/dt;
delay=mean(grpdelay(d))
tt = t(1:end-delay);
vd = vdrift;
vd(1:delay) = [];
tt(1:delay) = [];
vd(1:delay) = [];
[pkp,lcp] = findpeaks(drift);
zcp = zeros(size(lcp));
[pkm,lcm] = findpeaks(-drift);
zcm = zeros(size(lcm));
figure,plot(t,drift,t([lcp lcm]),[pkp -pkm],'-',"LineWidth",2)
Error Values of matrix are: Paul Hoffrichter on 7 Mar 2021
Multiple problems.
[lcp lcm] % this expression gives the error you are reporting
[pkp -pkm] % same error
Error using horzcat
Dimensions of arrays being concatenated are not consistent.
And since the arrays are wrong, it is not clear what your intent is. Did you want to stack lcp over lcm, like this:
a = [lcp; lcm];
length(a)
ans =
1859
Moving on, the following at least corrects the error message:
plot(t,drift, t([lcp; lcm]),[pkp; -pkm], '-', "LineWidth", 2);

Mario Malic on 7 Mar 2021
Hi Miguel,
When you type [var1 var2], you are concatenating horizontally, since your variables have different number of rows, you'll get an error.
This seems troublesome, I don't really understand what are you trying to do here, can you explain?
t([lcp lcm]),[pkp -pkm]
Miguel Minga on 7 Mar 2021
Thanks Mario
I tried it with this code and it works
figure
plot(t(lcp), pkp,'-', 'LineWidth',2)
legend('Max peak value')
xlabel('Time [s]')
ylabel('Displacement [mamsl]')

R2020a

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