Programmer Guide/Command Reference/EVAL/mul: Difference between revisions
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;Result: If both arguments ''x'' and ''y'' are vectors, the tensor (or dyadic) product of the vectors is computed and the result ''r'' is a matrix with <code>nrow(''x'')</code> rows and <code>nrow(''y'')</code> columns. | ;Result: If both arguments ''x'' and ''y'' are vectors, the tensor (or dyadic) product of the vectors is computed and the result ''r'' is a matrix with <code>nrow(''x'')</code> rows and <code>nrow(''y'')</code> columns. | ||
::<code>''r''<sub>i,j</sub> = ''x''<sub>i</sub> * ''y''<sub>j</sub></code> | ::<code>''r''<sub>i,j</sub> = ''x''<sub>i</sub> * ''y''<sub>j</sub></code> | ||
:For all other combinations of data types, the [[Programmer_Guide/Command_Reference/EVAL#Operators|operator *]] is applied to ''x'' and ''y'' and the product <code>''x''*''y''</code> is returned. If the multiplication is not possible ( | :For all other combinations of data types, the [[Programmer_Guide/Command_Reference/EVAL#Operators|operator *]] is applied to ''x'' and ''y'' and the product <code>''x''*''y''</code> is returned. If the multiplication is not possible (invalid combination of data types), the function <code>mul</code> failes. | ||
;See also: [[Programmer_Guide/Command_Reference/EVAL/trn|trn]], [[Programmer_Guide/Command_Reference/EVAL/inv|inv]], [[Programmer_Guide/Command_Reference/EVAL/complex arithmetic#special functions|ctrn, cmulv]] | ;See also: [[Programmer_Guide/Command_Reference/EVAL/trn|trn]], [[Programmer_Guide/Command_Reference/EVAL/inv|inv]], [[Programmer_Guide/Command_Reference/EVAL/complex arithmetic#special functions|ctrn, cmulv]] | ||
[[Programmer_Guide/Command_Reference/EVAL#Functions|<function list>]] | [[Programmer_Guide/Command_Reference/EVAL#Functions|<function list>]] | ||
Revision as of 15:06, 8 April 2011
Compute the inverse of x.
- Usage
mul(x, y)- Result
- If both arguments x and y are vectors, the tensor (or dyadic) product of the vectors is computed and the result r is a matrix with
nrow(x)rows andnrow(y)columns.ri,j = xi * yj
- For all other combinations of data types, the operator * is applied to x and y and the product
x*yis returned. If the multiplication is not possible (invalid combination of data types), the functionmulfailes.
- See also
- trn, inv, ctrn, cmulv
