Need help with 3d plot!!!

[blp82]

Hi everybody!
here is my problem

I have two matix 3rows x 120cols (foto1 and foto2).

I need to plot this function (axes a, b, y)

y=exp(-disab/100);

knowing that:

disab=((va(1,1)-vb(1,1))^2+(va(1,2)-vb(1,2))^2+(va(1,3)-vb(1,3))^2);

where va and vb are two vector 1x3:

va=[foto1(3,a-1) foto1(3,a) foto1(3,a+1)];
vb=[foto2(3,b-1) foto2(3,b) foto2(3,b+1)];

and axes a and b are 1:1:120


I have tried the following code:

[ a, b ] = meshgrid(1 : 1 : 120);

va=[foto1(3,a-1) foto1(3,a) foto1(3,a+1)];
vb=[foto2(3,b-1) foto2(3,b) foto2(3,b+1)];

disab=((va(1,1)-vb(1,1))^2+(va(1,2)-vb(1,2))^2+(va(1,3)-vb(1,3))^2);

y=exp(-(disab));

mesh(a,b,y);

but it doesn't work, I got this error:
Subscript indices must either be real positive integers or logicals.

How can I solve my problem???
Thankyou so much for your help!

blp

 

[yairsuari]

are you sure you got this massage from the function here and not from the foto function?