Why does MATLAB only appear to use half of my processor?

i have a computer with more than 3GHz CPU and 1Gb of Ram
but when i run my matlab simulation, my cpu usage always is less than 50 percent and my inuse virtual memory - for matlam.exe - is less than 277Mb (I see this information in TaskManager and I am using Windows XP SP1)
what is wrong?
why MATLAB use only a part of my CPU or Virtual memory abilities?
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mhaminiAsked:
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ben_staplesConnect With a Mentor Commented:
There may be a patch available.

Read through this thread, there is some very helpful information there.

http://forums.anandtech.com/messageview.aspx?catid=28&threadid=1707814&frmKeyword=&STARTPAGE=1&FTVAR_FORUMVIEWTMP=Linear
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ben_staplesCommented:
It may be that you are running a duel core processor and it is not optomised to use a duel processor system.

Do you see two seperate graphs when you look in the task manager?
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mhaminiAuthor Commented:
yes
I see two seperate graphs when I look in the task manager ...
what can i do for using all abilities of CPU?
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