頂点座標を空のnumpy.ndarrayに追加する操作。
よくやるのでメモ。
—(sample code)—–
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import cv2 import numpy as np ## cat pol_int (x-y point list) ## -126 133 ## -126 131 ## -117 131 ## -117 134 in_data = open("./plist") lines = in_data.readlines() arr = np.empty((0,2), int) for i in range(len(lines)): lines[i].strip() jj = lines[i].split() xx = int(jj[0]) yy = int(jj[1]) arr = np.append(arr, np.array([[xx, yy]]), axis=0) i = i + 1 print(arr) |
—(exec result)—–
[[-126 133]
[-126 131]
[-117 131]
[-117 134]]
—(memo)—-
initialize ndarray for x-y point list.
at first array is empty(no entry) and add_type is [x,y].
so initialize parameter is (0,2).
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arr = np.empty((0,2), int) |
if append for ndarray, append element must ndarray.
we use only 1 axis, so axis = 0(axis memo)
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arr = np.append(arr, np.array([[xx, yy]]), axis=0) |