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## Re: Octave: assume() command in symbolic toolbox.

 From: Colin Macdonald Subject: Re: Octave: assume() command in symbolic toolbox. Date: Wed, 25 Jan 2017 10:19:05 -0800 User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.5.1

```On 25/01/17 08:53, Constantine Frangos wrote:
```
```(1) How is the assume() command applied in order to limit
a symbolic variable w to a real interval (a, b], for example,
(-pi/2, pi/2], [0, pi], (-pi, pi], etc?
```
```
```
Unfortunately, I don't know any way to do this at the moment. If you're using "solve", perhaps you can pass inequality constraints to it?
```
```
The symbolic package uses Sympy; here is a perhaps helpful thread about this in Sympy:
```
http://stackoverflow.com/questions/19553652/sympy-limit-symbol-variable-to-interval

```
```(2) The documentation for the assume() command states that it
can be used as follows:

sym X = assume (X, COND1, COND2, …)

Some of the possible values for cond1, cond2, etc seem to be
'positive', 'negative', 'integer', 'real'.

What are all the other possible values?
```
```
See "help assumptions" and in particular:

>> assumptions ('possible')

```
The upcoming 2.5.0 release will have many more options (but still no general algebraic constraints).
```
best,
Colin

```

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