conditioning array with complex number

Question

JK 2021-9-14

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1452594-conditioning-array-with-complex-number

评论： Star Strider 2021-9-14

采纳的回答： Star Strider

I would like to apply a condition to make certain complex numbers to zero.

condition: if complex number * conj(complex number) is less than 0.5, set complex number to zero.

I tried A(A.*conj(A)<0.5)=0. it didn't work out.

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Answer 1

Star Strider 2021-9-14

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https://ww2.mathworks.cn/matlabcentral/answers/1452594-conditioning-array-with-complex-number#answer_786769

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This can probably be combined into fewer actual lines. I kept them separate to demonstrate the approach —

A = complex(rand(10),rand(10))
A = 
3470 + 0.8859i   0.0137 + 0.7639i   0.1015 + 0.7223i   0.5190 + 0.9946i   0.2642 + 0.9262i   0.1227 + 0.4625i   0.5610 + 0.0151i   0.9365 + 0.1072i   0.9752 + 0.7804i   0.8272 + 0.9432i
4636 + 0.2904i   0.1338 + 0.2256i   0.3974 + 0.6367i   0.9876 + 0.3169i   0.2435 + 0.0412i   0.3481 + 0.5287i   0.9613 + 0.8060i   0.3516 + 0.6644i   0.7104 + 0.0387i   0.1082 + 0.4680i
0129 + 0.6059i   0.0952 + 0.5557i   0.5719 + 0.9788i   0.2254 + 0.7534i   0.8180 + 0.1280i   0.5472 + 0.2541i   0.8326 + 0.8705i   0.0095 + 0.3066i   0.3927 + 0.4640i   0.7428 + 0.6265i
7454 + 0.4747i   0.4278 + 0.9148i   0.8096 + 0.6022i   0.7720 + 0.5985i   0.2754 + 0.3324i   0.9874 + 0.6228i   0.5922 + 0.1384i   0.9802 + 0.0692i   0.6346 + 0.6318i   0.1758 + 0.3041i
6405 + 0.2935i   0.5829 + 0.1763i   0.2208 + 0.8402i   0.5265 + 0.3813i   0.8351 + 0.2082i   0.9958 + 0.7694i   0.3690 + 0.7676i   0.6434 + 0.2222i   0.0020 + 0.1934i   0.6156 + 0.8573i
0943 + 0.9701i   0.3803 + 0.4209i   0.1179 + 0.9497i   0.9916 + 0.6548i   0.2876 + 0.1710i   0.0866 + 0.8797i   0.3089 + 0.4247i   0.3803 + 0.3770i   0.7961 + 0.3813i   0.2586 + 0.0791i
5874 + 0.2785i   0.2163 + 0.3044i   0.2791 + 0.4933i   0.2559 + 0.8200i   0.8186 + 0.4434i   0.2505 + 0.6017i   0.5400 + 0.9447i   0.1880 + 0.5847i   0.6254 + 0.6406i   0.3905 + 0.6088i
3084 + 0.0559i   0.5232 + 0.9541i   0.1421 + 0.3563i   0.6262 + 0.1674i   0.8474 + 0.7592i   0.1504 + 0.9597i   0.8628 + 0.9455i   0.9468 + 0.2465i   0.5404 + 0.7113i   0.6113 + 0.0233i
2909 + 0.3973i   0.9900 + 0.4806i   0.3832 + 0.9495i   0.3579 + 0.1691i   0.1201 + 0.1768i   0.3424 + 0.0581i   0.0161 + 0.4895i   0.9649 + 0.5228i   0.0355 + 0.1678i   0.8364 + 0.5422i
1649 + 0.9458i   0.4645 + 0.4179i   0.3430 + 0.6006i   0.5904 + 0.2400i   0.2482 + 0.3173i   0.3150 + 0.9556i   0.7045 + 0.5468i   0.8496 + 0.4076i   0.4556 + 0.8503i   0.0623 + 0.0865i
A2 = A.*conj(A)
A2 = 10×10
9052    0.5838    0.5320    1.2586    0.9276    0.2290    0.3150    0.8886    1.5600    1.5739
2992    0.0688    0.5634    1.0759    0.0610    0.4007    1.5737    0.5651    0.5061    0.2308
3672    0.3178    1.2851    0.6184    0.6855    0.3640    1.4510    0.0941    0.3695    0.9442
7809    1.0198    1.0182    0.9541    0.1864    1.3628    0.3699    0.9656    0.8019    0.1234
4964    0.3708    0.7546    0.4226    0.7408    1.5837    0.7253    0.4634    0.0374    1.1140
9499    0.3218    0.9158    1.4120    0.1120    0.7814    0.2758    0.2868    0.7791    0.0731
4225    0.1395    0.3212    0.7379    0.8667    0.4248    1.1840    0.3773    0.8014    0.5231
0983    1.1840    0.1471    0.4201    1.2945    0.9436    1.6383    0.9573    0.7979    0.3742
2425    1.2111    1.0484    0.1567    0.0457    0.1206    0.2399    1.2044    0.0294    0.9935
9217    0.3904    0.4783    0.4062    0.1622    1.0124    0.7954    0.8880    0.9305    0.0114
idx = A2 < 0.5
idx = 10×10 logical array
 0   0   0   0   1   1   0   0   0
 1   0   0   1   1   0   0   0   1
 1   0   0   0   1   0   1   1   0
 0   0   0   1   0   1   0   0   1
 1   0   1   0   0   0   1   1   0
 1   0   0   1   0   1   1   0   1
 1   1   0   0   1   0   1   0   0
 0   1   1   0   0   0   0   0   1
 0   0   1   1   1   1   0   1   0
 1   1   1   1   0   0   0   0   1
A(idx) = 0
A = 
3470 + 0.8859i   0.0137 + 0.7639i   0.1015 + 0.7223i   0.5190 + 0.9946i   0.2642 + 0.9262i   0.0000 + 0.0000i   0.0000 + 0.0000i   0.9365 + 0.1072i   0.9752 + 0.7804i   0.8272 + 0.9432i
0000 + 0.0000i   0.0000 + 0.0000i   0.3974 + 0.6367i   0.9876 + 0.3169i   0.0000 + 0.0000i   0.0000 + 0.0000i   0.9613 + 0.8060i   0.3516 + 0.6644i   0.7104 + 0.0387i   0.0000 + 0.0000i
0000 + 0.0000i   0.0000 + 0.0000i   0.5719 + 0.9788i   0.2254 + 0.7534i   0.8180 + 0.1280i   0.0000 + 0.0000i   0.8326 + 0.8705i   0.0000 + 0.0000i   0.0000 + 0.0000i   0.7428 + 0.6265i
7454 + 0.4747i   0.4278 + 0.9148i   0.8096 + 0.6022i   0.7720 + 0.5985i   0.0000 + 0.0000i   0.9874 + 0.6228i   0.0000 + 0.0000i   0.9802 + 0.0692i   0.6346 + 0.6318i   0.0000 + 0.0000i
0000 + 0.0000i   0.0000 + 0.0000i   0.2208 + 0.8402i   0.0000 + 0.0000i   0.8351 + 0.2082i   0.9958 + 0.7694i   0.3690 + 0.7676i   0.0000 + 0.0000i   0.0000 + 0.0000i   0.6156 + 0.8573i
0943 + 0.9701i   0.0000 + 0.0000i   0.1179 + 0.9497i   0.9916 + 0.6548i   0.0000 + 0.0000i   0.0866 + 0.8797i   0.0000 + 0.0000i   0.0000 + 0.0000i   0.7961 + 0.3813i   0.0000 + 0.0000i
0000 + 0.0000i   0.0000 + 0.0000i   0.0000 + 0.0000i   0.2559 + 0.8200i   0.8186 + 0.4434i   0.0000 + 0.0000i   0.5400 + 0.9447i   0.0000 + 0.0000i   0.6254 + 0.6406i   0.3905 + 0.6088i
0000 + 0.0000i   0.5232 + 0.9541i   0.0000 + 0.0000i   0.0000 + 0.0000i   0.8474 + 0.7592i   0.1504 + 0.9597i   0.8628 + 0.9455i   0.9468 + 0.2465i   0.5404 + 0.7113i   0.0000 + 0.0000i
0000 + 0.0000i   0.9900 + 0.4806i   0.3832 + 0.9495i   0.0000 + 0.0000i   0.0000 + 0.0000i   0.0000 + 0.0000i   0.0000 + 0.0000i   0.9649 + 0.5228i   0.0000 + 0.0000i   0.8364 + 0.5422i
1649 + 0.9458i   0.0000 + 0.0000i   0.0000 + 0.0000i   0.0000 + 0.0000i   0.0000 + 0.0000i   0.3150 + 0.9556i   0.7045 + 0.5468i   0.8496 + 0.4076i   0.4556 + 0.8503i   0.0000 + 0.0000i