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calculates the integral for an univariate S2Fun or sums up along a specified dimension fo a multimodal S2Fun

## Description

sF is a 3x3 S2Fun sum(sF) returns a 3x3 matrix with the integrals of each function sum(sF, 1) returns a 1x3 S2Fun wich contains the pointwise sums along the first dimension

## Input

 sF S2FunHarmonic d dimension to take the sum value over

## Output

 sF S2FunHarmonic value double