error using subplot,index exceed numbers of subplots

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Austin
Austin on 29 Oct 2013
Edited: Christopher Jones on 29 Oct 2013
x=1:1:10 for i=2:2:8 y=4*x-3*i subplot(4,1,i) plot(x,y) end
why do i keep getting this error- error using subplot,index exceed numbers of subplots

Answers (2)

Christopher Jones
Christopher Jones on 29 Oct 2013
Edited: Christopher Jones on 29 Oct 2013
Your subplot only has 4x1 subfigures ie 4 with indexes 1,2,3,4
Your index vector i on the other hand tries to access 2,4,6,8.
Two of those indexes (6,8) don't exist and exceed the number of subplots.
To quickly fix the problem just change the for argument to i=1:4 and add a *2 to the y function
figure;
x=1:1:10
for k=1:4
i = k*2;
y=4*x-3*i;
subplot(4,1,k);
plot(x,y) ;
end

Jos (10584)
Jos (10584) on 29 Oct 2013
A general solution that loops over the values using a separate index:
x=1:1:10
value = 2:2:8
N = numel(value)
for k = 1:N
y=4*x-3*value(k)
subplot(N,1,k)
plot(x,y)
title(sprint('Value #%d : %d',k,value(k))) ; % add a title
end

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