Insert NaN into specific values

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Augusto Gabriel da Costa Pereira
评论： Augusto Gabriel da Costa Pereira 2023-1-7
I use this code to insert all the lines in column 4 the numbers equal to 0 equal to NaN, but nothing happens.
That is, I want to insert NaN in all numbers equal to 0 of all rows in column 4.
Does anyone have an idea?
s=load('spi_dca.mat');
spi_dca = s.spi_dca;
mask=spi_dca(:,4)==0;
spi_dca(mask,4)=spi_dca(mask,4)==NaN;

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采纳的回答

Arif Hoq
Arif Hoq 2023-1-7
try this:
s=load('spi_dca.mat');
spi_dca = s.spi_dca;
col4=spi_dca(:,4);
col4(col4==0)=NaN;
output=[spi_dca(:,[1 2 3]),col4];

更多回答（1 个）

Voss
Voss 2023-1-7
s=load('spi_dca.mat');
spi_dca = s.spi_dca;
mask=spi_dca(:,4)==0;
spi_dca(mask,4)=NaN;

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