Programmer Guide/Command Reference/EVAL/mul: Difference between revisions
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{{DISPLAYTITLE:mul (alias: "x*y")}} | |||
Compute the inverse of ''x''. | |||
;Usage: | |||
:{|class="keinrahmen" | |||
|'''<code>inv(''x<sub>scalar</sub>)</code>''' | |||
|- | |||
|'''<code>inv(''x<sub>matrix</sub>)</code>''' | |||
|- | |||
|} | |||
;Result: The result has the same type as the argument ''x'' and is the inverse of ''x''. The argument ''x'' must be a scalar or a square matrix. | |||
;Note: This function can be used as alias for the operator *, which do not implement the dyadic product. both arguments ''x'' and ''y'' are vectors, the dyadic product is computed, otherwise the operator * is applied to ''x'' and ''y''. | |||
;See also: [[Programmer_Guide/Command_Reference/EVAL/trn|trn]], [[Programmer_Guide/Command_Reference/EVAL/mul|mul]], [[Programmer_Guide/Command_Reference/EVAL/complex arithmetic#special functions|ctrn]] | |||
[[Programmer_Guide/Command_Reference/EVAL#Functions|<function list>]] | |||
{{DISPLAYTITLE:{{SUBPAGENAME}}}} | {{DISPLAYTITLE:{{SUBPAGENAME}}}} | ||
=====mul===== | =====mul===== | ||
Revision as of 15:54, 8 April 2011
Compute the inverse of x.
- Usage
inv(xscalar)inv(xmatrix)
- Result
- The result has the same type as the argument x and is the inverse of x. The argument x must be a scalar or a square matrix.
- Note
- This function can be used as alias for the operator *, which do not implement the dyadic product. both arguments x and y are vectors, the dyadic product is computed, otherwise the operator * is applied to x and y.
Warning: Display title "mul" overrides earlier display title "mul (alias: "x*y")".
Contents
mul
Calculate the dyadic product of xv and yv.
Usage:
mul(xv,yv)
Return Type:
matrix - (nrow(xv) x nrow(yv))
Notes:
Note that if one of the arguments is not a vector, then x * y is calculated.
