Adding whitespace equivalent to a -ve sign

Adding whitespace equivalent to a -ve sign

[Dave]

Hi all,

I am trying to line up some equations on a page and I'd like to insert
some whitespace that has the same width as a -ve sign in an equation.
An example would be trying to ensure the cosine and sine and on the
first and second rows (second column) in the matrix below:

  \startpmatrix
    % Row 1
    \NC - \cos \theta_{\text{el}} \, \sin \theta_{\text{az}}
    \NC \cos \theta_{\text{az}}
    \NC \sin \theta_{\text{el}} \, \sin \theta_{\text{el}} \NR
    % Row 2
    \NC - \cos \theta_{\text{el}} \, \cos \theta_{\text{az}}
    \NC - \sin \theta_{\text{az}}
    \NC \sin \theta_{\text{el}} \, \cos \theta_{\text{el}} \NR
    % Row 3
    \NC - \sin \theta_{\text{el}}
    \NC 0
    \NC \cos \theta_{\text{el}} \NR
   \stoppmatrix

Any ideas?

Thanks,
Graham
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Re: Adding whitespace equivalent to a -ve sign

[Aditya Mahajan]

On Mon, 11 Feb 2008, Dave wrote:

> Hi all,
>
> I am trying to line up some equations on a page and I'd like to insert
> some whitespace that has the same width as a -ve sign in an equation.
> An example would be trying to ensure the cosine and sine and on the
> first and second rows (second column) in the matrix below:
>
>  \startpmatrix
>    % Row 1
>    \NC - \cos \theta_{\text{el}} \, \sin \theta_{\text{az}}
>    \NC \cos \theta_{\text{az}}

change this to

\NC \hphantom{-} \cos \theta ....

>    \NC \sin \theta_{\text{el}} \, \sin \theta_{\text{el}} \NR
>    % Row 2
>    \NC - \cos \theta_{\text{el}} \, \cos \theta_{\text{az}}
>    \NC - \sin \theta_{\text{az}}
>    \NC \sin \theta_{\text{el}} \, \cos \theta_{\text{el}} \NR
>    % Row 3
>    \NC - \sin \theta_{\text{el}}
>    \NC 0
>    \NC \cos \theta_{\text{el}} \NR
>   \stoppmatrix
>
> Any ideas?

Normally you have to be a bit careful with minus as it is both a uniary 
and binary operator. To get the space equal to a uniary operator 
\hphantom{-} should be ok, to get space equal to binary operator, you can 
try \hphantom{{}-} or \hphantom{{}-{}}

Aditya
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