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Scilab help >> Compatibility Functions > mtlb_a


Matlab addition emulation function


Matlab and Scilab addition behave differently in some particular cases:

  • With character string operands: The + operator is used into Scilab to catenate character strings, while Matlab realizes the sum of the operands ASCII codes.

  • With empty matrix: In Scilab, if one of the operands is an empty matrix the result of the addition is the other operand. In Matlab if one of the operand is an empty matrix the result of the addition should be an error or an empty matrix.

The function mtlb_a(A,B) is used by mfile2sci to replace A+B when it was not possible to know what were the operands 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_a calls:

  • If A and B are character strings, mtlb_a(A,B) may be replaced by asciimat(A)+asciimat(B)

  • If both A and B are not empty matrices mtlb_a(A,B) may be replaced by A+B, else mtlb_a(A,B) may be replaced by [].

  • If mtlb_mode==%T, then mtlb_a(A,B) may be replaced by A+B in any case where A and B are not character string matrices.

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

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Last updated:
Tue Apr 02 17:37:34 CEST 2013