How to specify an arbitrary slope with the vector command?

Question

i want to draw a vector with the vector command, but it seems like that the slope must be specified in integers less than some limit, thus commands like

\put(0,10){\vector(8,7){200}}

will failed to compile, but this works:

\put(0,10){\vector(1,0){200}}

so how can i specify arbitrary slope, is there a way to specify two endpoints rather than specifying the slope

Answer 1

This specific limitation is removed by the pict2e package (load the package and it should "just work"). However, for programmatic drawing in LaTeX these days I'd suggest looking into PGF/Tikz.

Answer 2

According to http://www.giss.nasa.gov/tools/latex/ltx-341.html, the \vector command takes only integers -5 < x, y < 5.