how to plot 3D graph using mesh() for a rectangular matrix of data?

Dear sir/madam,

I am using mesh() to plot 3D graphs. To plot a 3D graph the length of x-axis and y-axis must be equal, using mesh(). But I need to plot a 3D graph where the length of x-axis and y-axis are not equal. When I tried to plot the graph for unequal lengths, it showed "dimensions do not agree". How can I plot a 3D graph for unequal lengths, using mesh()? Looking forward for your reply.

Thanking you, BSD

Answer 1

[Christoph]

Maybe I missunderstood your problem but as far as I know the axis do not have to be of the same length.

x=1:1000;y=1:3500;%axis
for iter1=1:length(x)
for iter2=1:length(y)
z(iter1,iter2)=y(iter2)/x(iter1);%data
end
end
mesh(y,x,z)%plot it

y and x are not of the same length. The lengths of y,x need to fit the size of z though.

[Andrei Bobrov]

z = bsxfun(@rdivide,y,x')

[bsd]

Thanks for the reply. But what do you mean by "the lengths of y, x need to fit the size of z though", in your reply.

Thanking you,

BSD

[Christoph]

@andrei

thanks for your comment, I'm not that well versed with bsxfun and the like.

@bsd

I mean just what andrei wrote in his answer

"Z - array (of type)double with size [length(x),length(y)]"

Answer 2

[Andrei Bobrov]

[X,Y] = meshgrid(x,y);
Z = fun(X,Y);% or Z - array double with size [length(x),length(y)]
mesh(X,Y,Z)