Extracting xy coordinate points from a matrix, based on a limit for x.

Question

Nikan Fakhari 2020-10-8

回答： Ameer Hamza 2020-10-8

Hi there,

I have a xy matrix as follows that contains x and y points. From xy matrix I would like to extract points that their x values are between 2 and 5.

for example I would like to extract these points, (3,7) and (4,8) and save them in a new variable.

can anyone help me with this?

I would rather not use for loop because Im trying to do the same operation with a large data set and Im trying to avoid the use of for loop.

Thank you very much.

x = [1,2,3,4,5]

y = [5,6,7,8,9]

xy=[x;y]

Thank you very much.

Answer 1

Ameer Hamza 2020-10-8

Read about logical indexing

x = [1,2,3,4,5];
y  = [5,6,7,8,9];
xy = [x;y];
idx = (x > 2) & (x < 5);
xy_new = xy(:, idx);