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## Re: [Help-glpk] fraction with vars

 From: Michael Hennebry Subject: Re: [Help-glpk] fraction with vars Date: Wed, 2 May 2012 11:36:28 -0500 (CDT) User-agent: Alpine 1.00 (DEB 882 2007-12-20)

```On Wed, 2 May 2012, Kasper Tordrup wrote:

```
```After looking over Xypron's example, it became clear to me that you lack
some information, sorry for that.
The x represent a percentage of p that I need, and this means that y is <=
to w.
So summing up:
x will always be <= to p.
y will always be <= to w.
if w is 0, then so are y.
p is a constant.
x,y and w are variables.
y and w are in the range [0..6] (or close to that)
and I want to calculate:
x_suj = p_s * (y_suj/w_su)
```
```
(repeating)
```
```if w is 0, then so are y.
```
```
x_suj * w_su = p_s * y_suj

No division issues.

(repeating)
```
```The x represent a percentage of p that I need, and this means that y is <=
to w.
```
```
Are you sure?

```
```Sorry for the mess, hope this clarifies it.
```
```
Actually, 'tis a bit foggier now.
What is p? Can it be 22/7, 7/22, sqrt(2.), 1/123, pi?
Is the equality exact?
Why is there a percentage involved instead of a fraction?
One does not normally calculate with percentages.
Usually, percentages are just human-friendly input or output.

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