Programmer Guide/Command Reference/EVAL/mul: Difference between revisions
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{{DISPLAYTITLE:mul (alias: "x*y")}} | {{DISPLAYTITLE:mul (alias: "x*y")}} | ||
Compute the | Compute the product of the arguments. | ||
;Usage: | ;Usage: <code>mul(''x'', ''y'')</code> | ||
;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 [[ | :For all other combinations of data types, the [[../#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 fails. | ||
;See also: [[ | ;See also: [[../trn|trn]], [[../inv|inv]], [[../complex arithmetic#special functions|ctrn, cmulv]] | ||
[[ | [[../#Functions|<function list>]] | ||
Latest revision as of 11:24, 21 April 2011
Compute the product of the arguments.
- 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 function fails.
- See also
- trn, inv, ctrn, cmulv
