# [pstricks] problem in equation numbering

Herbert Voss Herbert.Voss at FU-Berlin.DE
Thu Apr 18 18:51:14 CEST 2013

On 18.04.2013 17:45, Kari Eloranta wrote:

> \info{{\blue Resistance}\\%
> The resistance of an electrical component is
>
> R=\frac{V}{I}
> \label{eq:res}
> where $V$ is the potential difference across the component, and $I$ the electric current flowing through it.}
>
> the equation number (label) becomes 1.20 in the output pdf. However, when I try use \ref{eq:res} to reference the equation, the reference tag is 1.10 instead of 1.20. Recompiling does not help. Is there a solution to this problem?

try

$$\label{eq:res} R=\frac{V}{I}$$

the label should be inside the environment.
if it doesn't help then provide a _complete_ example

Herbert