a version of cov that handles nanflag has been pushed to core with bug #50583

patch #10314 was pushed to default (ported from statistics to core) that includes matlab compatible mean, median, var, and std handling of the nanflag opton. most of the other comment #0 functions mentioned still unchanged.

might be worth going through this list to determine if nanflag been implemented, or even just patches submitted, since this was posed in 2017.  (e.g., there' a patch sitting at bug #50007 for min and max). 

re-titling to indicate that this bug covers far more than just sum.

This is basically the same issue as bug #50007.

Matlab provides optional string arguments to some core functions that allow you to omit NaN values. Please excuse the cut & paste job... the result of a search for "nanflag" in the matlab online documentation.

I'm fairly sure most of these derive from the fundamental sum, median, min, max functions so the list is almost certainly redundant.

median - Median value of array
This MATLAB function returns the median value of A.

min - Smallest elements in array
This MATLAB function returns the smallest elements of A.

max - Largest elements in array
This MATLAB function returns the largest elements of A.

sum - Sum of array elements
This MATLAB function returns the sum of the elements of A along the first array dimension whose size does not equal 1.

mean - Average or mean value of array
This MATLAB function returns the mean of the elements of A along the first array dimension whose size does not equal 1.

std - Standard deviation
This MATLAB function returns the standard deviation of the elements of A along the first array dimension whose size does not equal 1.

bounds - Smallest and largest elements
This MATLAB function returns the smallest element S and largest element L of an array.

cov - Covariance
This MATLAB function returns the covariance.

var - Variance
This MATLAB function returns the variance of the elements of A along the first array dimension whose size does not equal 1.

prod - Product of array elements
This MATLAB function returns the product of the array elements of A.

cummin - Cumulative minimum
This MATLAB function returns the cumulative minimum elements of A.

cummax - Cumulative maximum
This MATLAB function returns the cumulative maximum elements of A.

cumprod - Cumulative product
This MATLAB function returns the cumulative product of A starting at the beginning of the first array dimension in A whose size does not equal 1.

cumsum - Cumulative sum
This MATLAB function returns the cumulative sum of A starting at the beginning of the first array dimension in A whose size does not equal 1.

movmean - Moving mean
This MATLAB function returns an array of local k-point mean values, where each mean is calculated over a sliding window of length k across neighboring elements of A.

movmax - Moving maximum
This MATLAB function returns an array of local k-point maximum values, where each maximum is calculated over a sliding window of length k across neighboring elements of A.

movmedian - Moving median
This MATLAB function returns an array of local k-point median values, where each median is calculated over a sliding window of length k across neighboring elements of A.

movmin - Moving minimum
This MATLAB function returns an array of local k-point centered minimum values, where each minimum is calculated over a sliding window of length k across neighboring elements of A.

movsum - Moving sum
This MATLAB function returns an array of local k-point sums, where each sum is calculated over a sliding window of length k across neighboring elements of A.

medfilt1 - 1-D median filtering
This MATLAB function applies a third-order one-dimensional median filter to the input vector, x.

movstd - Moving standard deviation
This MATLAB function returns an array of local k-point standard deviation values.

movvar - Moving variance
This MATLAB function returns an array of local k-point variance values, where each variance is calculated over a sliding window of length k across neighboring elements of A.

movprod - Moving product
This MATLAB function returns an array of local k-point products, where each product is calculated over a sliding window of length k across neighboring elements of A.

movmad - Moving median absolute deviation
This MATLAB function returns an array of local k-point median absolute deviations (MADs), where each MAD is calculated over a sliding window of length k across neighboring elements of A.

smoothdata - Smooth noisy data
This MATLAB function returns a moving average of the elements of a vector using a fixed window length that is determined heuristically.