Is there a way to replace a specific NaN elements by integer where isnan would not work with steps greater than 1?

Hello All,

Could you please help with this problem

I have this matrix

   hh=[NaN 1 2 3 4;3 5 66 NaN 6;NaN 3 4 7 NaN; 9 NaN 8 2 NaN];

and I want to replace only the NaN in some places to an integer. I have tried this hh(isnan(hh(1:2:4,1)))=1; which should replace the NaN in element (3,1) by 1 but did not work

Answer 1

[Walter Roberson]

mask = isnan(hh(:, 1)); mask(2:2:end) = false;
hh(mask) = 1;

[Abdulaziz Abutunis]

Thank you Walter, I tried your example and it will replace all the NaN in the first column. Best

[Walter Roberson]

isnan(hh(1:2:4,1)) is true for hh(1,1) so you have indicated that you do want hh(1,1) to be replaced.