Numpy数组array和矩阵matrix转换方法
1、ndarray转换成matrix
importnumpyasnp
fromnumpyimportrandom,mat
r_arr=random.rand(4,4)
print('r_arr',r_arr)
r_mat=mat(r_arr)
print(r_mat.I)#求逆
运行结果：
r_arr[[0.65603592 0.39908438 0.44722351 0.92652759]
[0.32357477 0.45384697 0.31687359 0.73861219]
[0.3534119 0.12693696 0.15701767 0.9163409]
[0.36515841 0.87377377 0.44150506 0.4605718]]
r_mat[[0.65603592 0.39908438 0.44722351 0.92652759]
[0.32357477 0.45384697 0.31687359 0.73861219]
[0.3534119 0.12693696 0.15701767 0.9163409]
[0.36515841 0.87377377 0.44150506 0.4605718]]
[[ 2.20907786-11.21482242 4.73076477 4.12886716]
[-1.79239654 -4.48728612 3.52875987 3.78121743]
[ 2.86148809 15.82430961-11.71577803 -7.82425058]
[-1.09402215 2.23536661 0.78545617 -0.77549894]]
importnumpyasnp
fromnumpyimportrandom,mat,eye
r_arr=random.rand(4,4)
print('r_arr',r_arr)
r_mat=mat(r_arr)
print('r_mat',r_mat)
r_invmat=r_mat.I
#print(r_mat.I)
r2_mat=r_mat*r_invmat
print('r2_mat',r2_mat)
print('error',r2_mat-eye(4))
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