Zip list and sort by Y-value

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Permalink Reply by Marc on June 1, 2017 at 1:48am

Hello,

A couple of list comprehensions should do the trick:

## Script start ##

# get the y-values from your points list
y_values = [pt[1] for pt in points]

# zip the points and y_values lists together and sort by the y_values
sorted_pts_y = [pt for (y, pt) in sorted(zip(y_values, points))]

# get the x-values from your now freshly sorted points list
x_values = [pt[0] for pt in sorted_pts_y]

# zip the sorted_points_y and x_values lists together and sort by the x-values
sorted_pts_xy = [pt for (x, pt) in sorted(zip(x_values, sorted_pts_y))]

## Script end ##

If your not familiar with Python list comprehensions, simply google them to find out more about it.

Basically, this:

    y_values = [pt[1] for pt in points]

Is the same as this:

    y_values = []
    for pt in points:
        y_values.append(pt[1])

Furthermore, this part:

    sorted_pts_y = [pt for (y, pt) in sorted(zip(y_values, points))]

Is the same as this:

    sorted_pts_y = []
    for (y, pt) in sorted(zip(y_values, points)):
        sorted_pts_y.append(pt)

Permalink Reply by Marc on June 1, 2017 at 1:52am

Here is an example.

Attachments:

• sort_xy.gh, 7 KB