Low Pass Filter in SCILAB

[Milind Gupta]

Hello,
I have a signal vector and I wanted to low pass filter it. My knowledge 
of discrete filters is very limited so any help would be greatly 
appreciated.
My signal is basically a sampled instance of a sum of sinusoids of 100Hz 
and 1KHz. What I want to do is basically filter this sampled signal so 
that I am just left with the 100Hz signal and then plot the resulting 
signal.
So basically I just need a low pass filter with a cut off frequency of 
200Hz and large attenuation at say 800Hz and beyond.
Any leads, help would be appreciated.

Thanks,
Milind