I am trying to use a procedure say f1 as a formal parameter for another procedure say f2 . f2 need to evaluate gradient of f1.But how can I give the coordinate for finding gradient. please see attached 

func.mw

I called an external function for Gauss elimination written in C in Linux. I successfully compiled and used following command in maple worksheet.

mygauss:=define_external('main',LIB="/home/user/Desktop/gauss.so"):

it gave the following output

cannot dynamically load executable

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The C code is attached gauss1.txt.

 gauss1.txt

I am using external library function but it shows following error. please help.

dll.mw

when evalhf is used it shows error. please help

evalhf.mw

I used thread for a loop and found that it takes more time than evalf. Please help to decrease the computational cost. Thank you.

thread_mp.mw