nansum alternative coding for operations and plotting figures.

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Eric Escoto 2021-8-19

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评论： Eric Escoto 2021-8-19

Hello,

I am reciving a message from MATLAB saying that 'nansum' use is not reccomended and to use 'sum' instead, with the appropriate code changes.

However, I have data that needs to be operated on (sum/difference/division/etc.) and at the same time this data needs to be plotted in figures.

Using '0's' in place of NAN is fine for operating on, but when I use '0' for plotting, MATLAB thinks '0' is a value and fills in with color. The only way I've ever found it possible to plot '0' values as empty is by using 'NAN's'.

I am specifically using the 'patch' function to plot my data.

Just wondering if there is someone out there that can offer coding changes to agree more with MATLAB reccomendations.

Thanks.

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Mike Hosea 2021-8-19

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Are you saying that if you could use nansum, you wouldn't have a problem? With SUM you do not need to convert NaNs to zeros. You just add the 'omitnan' flag to your sum call.

>> x = magic(3)
x =
     8     1     6
     3     5     7
     4     9     2
>> x(2,2) = nan
x =
     8     1     6
     3   NaN     7
     4     9     2
>> sum(x,1,'omitnan')
ans =
    15    10    15
>> sum(x,2,'omitnan')
ans =
    15
    10
    15