subplot command does not work

Hi, I am very new to MATLAB and I am stuck on this one problem. I cannot use subplot code. Here is the ss of the error code and the source code

Answer 1

[Dave B]

I think you wanted commas and not colons:

subplot(2,1,1)
plot(rand(1,10),'r')
title('red')

subplot(2,1,2)
plot(rand(1,10),'b')
title('infrared')

But if you're using a recent version of MATLAB (and you noted 2021b in the question), do yourself a favor and use tiledlayout/nexttile instead of subplot:

figure
t=tiledlayout(2,1);

nexttile
plot(rand(1,10),'r')
title('red')

nexttile
plot(rand(1,10),'b')
title('infrared')

[Omer hakan Yaran]

it works! thank you