mesh from 1D (creating a matrix from a vector)

Hello,

I have a vector A[-3:0.003:3] and a vector B whose values corresponding to those of A. I plotted B as a function of A ( it shows a curve like a gaussian). I would like now to plot in 3D using mesh. From vector A, i have to use two vectors x and y and I have to find a matrix from vector B.

Any help and I thank you in advance!

Adam

Answer 1

[Matt J]

Sounds like MESHGRID or NDGRID is what you want.

[adam]

Thank you! yes to create x and y , we can use ndgrid [x y]=ndgrid([A]) But I don't know why do I create a matrix from the vector B, whose the values corresponding to the vectors x and y

I hope that my question is clear

Thank you

[Matt J]

Well, that depends on the functional form of B. The general benefit of ndgrid/meshgrid, however, is that you can now do element-wise operations involving x and y to generate B:

B=x.^2+y.^2;
mesh(x,y,B);

[adam]

Hello, Thank you for your answer. But you didn't understand my question.

- I create two vectors x and y from the vector A provided that A=x.^2+y.^2.

- I have to create a matrix C from the vector B.

In this case i can plot mesh(x,y,C)

Thank you!

[Matt J]

Hello, Thank you for your answer. But you didn't understand my question.

Still don't...