How to remove Y value for given X

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Devon Fisher-Chavez
评论： David Fletcher 2018-3-12
I have two columns, X and Y.
The X column is a series of consecutive numbers (1,2,3...). The Y column is my data.
I want to make Y=NaN at certain X values
for example, lets say: x= 1,2,3,4,5 and y= .4,.6,.2,.6,.9
I want to remove the y=.6 that corresponds to x=4 How do I do this?
Thanks!

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David Fletcher
David Fletcher 2018-3-12
编辑：David Fletcher 2018-3-12
data=[1 0.4;2,0.6;3,0.2;4,0.6;5 0.9]
index=data(:,1)==4;
data(index,2)=NaN
Something like this?
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