replacing Nan with 0
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I have an excel file that I need to replace nan with zeros
I am using this piece of code and am getting error : Array indices must be positive integers or logical values
Error in "isnan(auPoints(r,c)) = 0;
I am not sure how to fix it or what I am doing wrong
for r = 4:1:22
for c = 2:1:29
if isnan(auPoints(r,c))
isnan(auPoints(r,c))
end
end
end
回答（3 个）
Star Strider
2020-7-25
Try this:
auPoints - fillmissing(auPoints, 'constant',0);
It might be advisable to save the output to a different variable, in order to preserve the original ‘auPoints’ matrix.
madhan ravi
2020-7-25
编辑：madhan ravi
2020-7-25
auPoints(isnan(auPoints(r, c))) = 0
2 个评论
Caroline Prekker
2020-7-25
madhan ravi
2020-7-25
编辑：madhan ravi
2020-7-26
Well it’s assumed that c was within the bounds.
Try this: (OBSCURE)
auPoints = subsasgn(auPoints, substruct('()', {isnan(auPoints)}), 0)
jonas
2020-7-25
The line does not work because the left part just returns a logical.
isnan(auPoints(r,c)) = 0
It is similar to writing
isnan(NaN) = 0
...which makes no sense but returns the same error message
For this type of basic operation it is better to make use of logical indexing. For example, if you want to replace all your NaNs with zeros, you can write the following
mask = isnan(auPoints);
auPoints(mask) = 0;
The first line returns a logical array (1's and 0's) with the same size as the original array. This array is then used to index the original array. Faster and easier than loops.
4 个评论
Caroline Prekker
2020-7-25
I don't see how that is possible. The variable mask is literally defined in the first out of the two lines.
Still, you could try the following:
auPoints(isnan(auPoints)) = 0
Note that this is exactly the same, just reduced to one line
Houss Leng
2022-8-10
I have this error Undefined function 'isnan' for input arguments of type 'table'.
Walter Roberson
2022-8-10
https://www.mathworks.com/help/matlab/ref/fillmissing.html like Star Strider suggests
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2020-7-25
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