Hot to locate indices of 2-D data located out of circle?

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Abdulaziz Abutunis
Abdulaziz Abutunis 2019-11-17
评论： Abdulaziz Abutunis 2019-11-18
Dear All,
I have x,y data that are extracted from a triangle solution. I wonder if there is a command (no loop) that will find the indices of elements when x^2+y^2 > than a specific value. The reason I want to eliminate them.
Thank you
Aziz

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Walter Roberson
Walter Roberson 2019-11-17
vector_of_y_values = (1:number_of_rows) - y_center;
vector_of_x_values = (1:number_of_columns) - x_center;
[Yg, Xg] = ndgrid(vector_of_y_values, vector_of_x_values);
idx = find(Xg.^2 + Yg.^2 > specific_value);
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Walter Roberson
Walter Roberson 2019-11-17
I forgot to account for possible scale factors such as the possibility that the x coordinates are percentage. The x and y vectors should be constructed so that they list the x and y coordinates, such
linspace(firstx, lastx, number of x)

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