conditioning array with complex number

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.

Answer 1

[Star Strider]

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

A = complex(rand(10),rand(10))

A = 
   0.3470 + 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
   0.4636 + 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
   0.0129 + 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
   0.7454 + 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
   0.6405 + 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
   0.0943 + 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
   0.5874 + 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
   0.3084 + 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
   0.2909 + 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
   0.1649 + 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

0.9052 0.5838 0.5320 1.2586 0.9276 0.2290 0.3150 0.8886 1.5600 1.5739 0.2992 0.0688 0.5634 1.0759 0.0610 0.4007 1.5737 0.5651 0.5061 0.2308 0.3672 0.3178 1.2851 0.6184 0.6855 0.3640 1.4510 0.0941 0.3695 0.9442 0.7809 1.0198 1.0182 0.9541 0.1864 1.3628 0.3699 0.9656 0.8019 0.1234 0.4964 0.3708 0.7546 0.4226 0.7408 1.5837 0.7253 0.4634 0.0374 1.1140 0.9499 0.3218 0.9158 1.4120 0.1120 0.7814 0.2758 0.2868 0.7791 0.0731 0.4225 0.1395 0.3212 0.7379 0.8667 0.4248 1.1840 0.3773 0.8014 0.5231 0.0983 1.1840 0.1471 0.4201 1.2945 0.9436 1.6383 0.9573 0.7979 0.3742 0.2425 1.2111 1.0484 0.1567 0.0457 0.1206 0.2399 1.2044 0.0294 0.9935 0.9217 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   0   1   1   0   0   0
   1   1   0   0   1   1   0   0   0   1
   1   1   0   0   0   1   0   1   1   0
   0   0   0   0   1   0   1   0   0   1
   1   1   0   1   0   0   0   1   1   0
   0   1   0   0   1   0   1   1   0   1
   1   1   1   0   0   1   0   1   0   0
   1   0   1   1   0   0   0   0   0   1
   1   0   0   1   1   1   1   0   1   0
   0   1   1   1   1   0   0   0   0   1

A(idx) = 0

A = 
   0.3470 + 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
   0.0000 + 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
   0.0000 + 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
   0.7454 + 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
   0.0000 + 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
   0.0943 + 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
   0.0000 + 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
   0.0000 + 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
   0.0000 + 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
   0.1649 + 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

Experiment to get different results.

.

[JK]

thanks, it is working well.

[Star Strider]

My pleasure!

If my Answer helped you solve your problem, please Accept it!

.