Dear Olivier, Thank you very much for your help. It worked fine! Tetsuro Kikuchi Olivier Delalleau <shish@keba.be> 宛先: Discussion of Numerical Python <numpy-discussion@scipy.org> 送信者: cc: numpy-discussion-bounce 件名: Re: [Numpy-discussion] How to modify an array s@scipy.org 2012/02/27 10:01 Discussion of Numerical Python へ返信してくださ い This should do what you want: array_copy = my_array.copy() array_copy[array_copy == 2] = 0 -=- Olivier Le 26 février 2012 19:53, <tetsuro_kikuchi@jesc.or.jp> a écrit : Dear sirs, Please allow me to ask you a beginner's question. I have an nparray whose shape is (144, 91, 1). The elements of this array are integer "0", "1" or "2", but I don't know which of the three integers is assigned to each element. I would like to make a copy of this array, and then replace only the elements whose value is "2" into "0". Could you teach how to make such a modification? Sincerely yours, Tetsuro Kikuchi _______________________________________________ NumPy-Discussion mailing list NumPy-Discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion _______________________________________________ NumPy-Discussion mailing list NumPy-Discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion