Modifying a function (2D Plot and 3D Plot)

• I currently have a grid that goes from 1 to 20 for x and y.

function [ ] = make3DGrid( )

x=zeros(20*20,1);

y=zeros(20*20,1);

count = 1;

for i=1:20

for j=1:20

x(count) = i;

y(count) = j;

count = count+1;

end

end

• How do I modify this function so that it takes 6 arguments (in this order): xmin, xmax, numx, ymin, ymax, numy. I want these to be the min and max ranges for a grid of data points.
• Also, instead of having just the x and y variables, how could I modify the function to use/return a single matrix (gridXY) which would be a nx2 matrix of the x and y locations on the grid.

For the first part, I know linspace might be involved but I'm not sure. Any help would be appreciated! Thanks.

[Rik]

Why did you materially change your question? Now my answer doesn't make sense.

[Rena Berman]

(Answers Dev) Restored edit

Answer 1

[Rik]

Use linspace separately for x and y and then use meshgrid or ndgrid.

%create the vectors
x=linspace(xmin,xmax,numx);
y=____

%create the grid of all combinations
[x,y]=ndgrid(x,y);

%reshape x and y into vectors
x=x(:);
____

%create nx2 matrix
result=____

[Aasiya Syed]

would I have to change anything with the for loops?

[Rik]

Yes, you can remove them. This code will be a complete replacement.

[Aasiya Syed]

what should the result be ?

[Rik]

If you fill in the missing parts of this code you will end up with two vectors. How would you make an nx2 matrix from two vectors?