how to find correlation coefficient?

 a=[ 1 3 4 5 6 7;4 5 6 7 2 1;2 3 4 5 6 7;]

now the a will be rearranged

 b=[1 2 4 6 7 5;2 7 6 4 1 5;7 5 3 4 2 1]

how to find correlation coefficient and plot?

[Patrik Ek]

What is wrong with corrcoef? Also what do you want to plot? the correlation coeffefficient is a number, or a matrix [autoCorrA,xCorrAB;xCorrBA,autoCorrB]

[Anusha]

plot the graph for correlation coefficient

[Patrik Ek]

Plot the graph of a number? I cannot see what you are talking about. The correlation coefficient of a two matrices are defiend as above

corrcoef = [autoCorrA,xCorrAB;xCorrBA,autoCorrB];

where every element is a number. Do you mean that you what the cross correlation sequence ( xcorr ), or do you even want the cross correlation matrix? These are not the same as the correlation coefficient. Also do you want help of finding out how to plot something and which functions to use to plot, like plot, plot3, surf, ..., or do you want help to calculate whatever you tries to plot? This needs to be clarified since more people will look at this later on and I need to be sure of what I answer.

Answer 1

[Jos (10584)]

a = a(:) % transform into vectors
b = b(:)
plot(a, b, 'b.')
xlabel('Value of a') ;
ylabel('Value of b') ;
lsline % LS regression line

[r,p] = corrcoef(a,b) ;
r = r(1,2)
p = p(1,2)