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Ajuda do Scilab >> Funções de Compatibilidade > mtlb_sum


Matlab sum emulation function


Matlab and Scilab sum behave differently in some particular cases:

  • When called with one input: Matlab sum treats the values along the first non-singleton dimension of input while Scilab sum threats all values of input.

  • When called with two inputs: Matlab sum can be used with second input giving a non-existing dimension of first input while Scilab sum returns an error message.

The function mtlb_sum(A[,dim]) is used by mfile2sci to replace sum(A[,dim]) when it was not possible to know what were the inputs while porting Matlab code to Scilab. This function will determine the correct semantic at run time. If you want to have a more efficient code it is possible to replace mtlb_sum calls:

  • When called with one input, if A is an empty matrix, a scalar or a vector, mtlb_sum(A) may be replaced by sum(A)

  • When called with one input, if A is a not-empty matrix, mtlb_sum(A) may be replaced by sum(A,1)

  • When called with one input, if A is a multidimensional array, mtlb_sum(A) may be replaced by sum(A,firstnonsingleton(A))

  • When called with two inputs, if dim is lesser than the number of dimensions of A mtlb_sum(A,dim) may be replaced by sum(A,dim)

Caution: mtlb_sum has not to be used for hand coded functions.

See also

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Last updated:
Mon Feb 12 19:58:45 CET 2018