[pstricks] tangential vector

[Martin Chicoine]

> 
> Here is a version that extends from -#2 to #3, with #1 being the x
> point and
> #4 being the function:
> 
> \psplotTangent{#1}{#2}{#3}{#4}
> 

Of course, it is better to change the name:

    \documentclass{article}
    
    \usepackage{pstricks-add}

    \makeatletter
    \def\psplotAsymTangent{\pst at object{psplotAsymTangent}}  
    \def\psplotAsymTangent at i#1#2#3#4{%


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Martin.