Error using plot - Vectors must be the same length.

Hi

I want to plot my correlaton values and diffrence between two values from which correlation was correlated but keep getting errors:

L = length(A) - 300;

B = zeros(L, 1);

for i = 1 : L

cc = corrcoef(A(i:i+300), S(i:i+300))

B(i) = cc(2,1);

end

plot(B);

Z=A-S;

figure(2)

plot(B,Z);

or

plot(cc,Z);

Is it possible to do in matlab ? I tried and error appears in command window:

Error using plot

Vectors must be the same length.

Any help would be appriciable.

Answer 1

[David Wilson]

It's a little hard to second guess what you are trying to do, but it seems that you need to pad vector B with zeros or something (such as NaN) to make it the same length as the original A.

When you do the correlation now, you can just dump/ignore the final 300 values.

A = randn(1e3,1); % set some random data 
S = randn(1e3,1); % set some more 

L = length(A) - 300;
B = NaN(length(A), 1); % note B is pre-allocated same a A 
for i = 1 : L
    cc = corrcoef(A(i:i+300), S(i:i+300)); 
    B(i) = cc(2,1);
end
plot(B);
Z=A-S;
figure(2)
plot(B,Z);

[Bob]

Hi David,

It worked, However, how Can I plot B values at X axis and Z values at Y axis and in diffrent colors ?

Thanks