How to only plot data points within a certain range?

Let's say I have data points from 1 to 10000 (logarithmic) for both x and y, but only want to plot the points for x>10 and y<10 on a scatter plot. How would I do that?

What if I were to only exclude that region from the graph? How would I go about doing that?

Moreover, how can I count the number of data points only within that region using MatLab?

Answer 1

[Star Strider]

One approach:

x = randi(50, 1, 50);                               % Create Data
y = randi(50, 1, 50);                               % Create Data

figure(1)
scatter(x, y, 'p')
grid
axis([0  50    0  50])
title('Original Data')

m = (x > 10) & (y < 10);                            % Select Data (Logical Vector)

figure(2)
scatter(x(m), y(m), 'p')
grid
axis([0  50    0  50])
title('Selected Data')

[Brian Hsiao]

Thank you! How do I count the number of points within that range?

[Star Strider]

My pleasure!

One additional line will give you that information:

m = (x > 10) & (y < 10);                            % Select Data (Logical Vector)
NrInRange = nnz(m);                                 % Number Of Points Meeting Criteria

another option:

NrInRange = sum(m);                                 % Number Of Points Meeting Criteria