find index of points in meshgrid under the line

I have 2D mesh grid of 501*2001. I want to get indices of values for the grid points in straight line to change the values of grid amplitude as shown in figure.

Answer 1

[KSSV]

Read about knnsearch. You will get the the required/ nearest indices for the given line from the grid.

[Abhishek Saini]

Thanks for the suggestion.

But I have only end cordinateds of the line like (x1,y1) and (x2,y2). I didnot understand the use of knnsearch for this case

[KSSV]

You can generate the points on the line no deal. Read about interp1. Alternatively you may try with this function. https://in.mathworks.com/matlabcentral/fileexchange/22441-curve-intersections?focused=5165138&tab=function

[Abhishek Saini]

Let me rephrase my question. I think i was not clear in my question.

I have 2D meshgrid of size 501x2001. Now what I would like to do is to change the value of grid in a linear form in a straight line manner. So that If I use imagesc it will show two different values.

I know the cordinates of line where I have to change the values but I want to get the values in between the two end cordinates to get all the index.

[KSSV]

I got your question......the answer works.