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Try to use "epstopdf".
1) Generate eps file with Matlab
2) epstopdf
3) and then just go to prosper...

Just in case you are still using and old version of prosper,
try this one available at
http://www.ctan.org/tex-archive/macros/latex/contrib/supported/prosper/
Don't ask me why only a very old version is available to
download from http://prosper.sourceforge.net/

Regards,
JR