error using subplot,index exceed numbers of subplots

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Austin
Austin 2013-10-29
编辑： Christopher Jones 2013-10-29
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

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回答（2 个）

Christopher Jones
Christopher Jones 2013-10-29
编辑：Christopher Jones 2013-10-29
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) 2013-10-29
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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