# symbolic matrix norm

Matlab has symbolic matrix norm, does Sage also have a command to compute the norm of a symbolic matrix?

Thanks in advance!

symbolic matrix norm

Matlab has symbolic matrix norm, does Sage also have a command to compute the norm of a symbolic matrix?

Thanks in advance!

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It depends on what you call a "symbolic matrix". If `M`

is a matrix with entries in the symbolic ring `SR`

, then `M`

has a method `.norm()`

that computes **a** norm of `M`

(you can specify which norm as a parameter). However, this method only works when the entries of the matrix can be converted to fixed real or complex numbers (elements of `CDF`

or `RDF`

).

for more details, type:

```
sage: M.norm?
```

for the documentation and

```
sage: M.norm??
```

for the source code of this method.

Hence, if you want to compute a norm (there are many possibilities) of a matrix with symbolic entries such as `cos(x)`

, then you have to write your own function.

Asked: **
2013-11-07 04:54:05 -0500
**

Seen: **449 times**

Last updated: **Nov 07 '13**

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