Hello,

I am plotting a three dimensional plot within a range in maple. There are two variables x and y. Third dimension is the objective function ( Z).

On this three dimensional plot, I want to show the point ( preferably by some colour, say red) which have maximum objective value. How it can be done in maple?

Also, Can I show the maximum objective function value (Z) and its coordinates (x,y) on the graph.

Thanks and regard,

Nilesh

Hi,

I have 6 by 6 Hessian matrix H. I want to check whether it is a negative definite. The rule of negative definite is "if and only if its n leading principlal minors alternate in sign with the kth order leading principal minor should have same sign as (-1)^k".

In my Hessian H, some leading principal minor of H is zero while the nonzero ones follows above rule. So negative definite test fails and Now I have to check negative semidefinite test which state that "H is negative semidefinite if and only if every principal minor of odd order is <=0 and every principal minor of even orderis >=0". So I have to check sign of every principal minor ( instead of just leading principal minor) to check for negative semidefinite of H matrix.

Can anyone help me how can I compute sign of all principal minor of a 6 by 6 square Hessian matrix.

Thanks and Regards,

Nilesh

Hi,

While running a maple code, I am getting a "invalid if statement termination" error. Most of time when I use nested for loop and if statement inside the loop, I am getting this error. Another error I get frequently is "Error, unterminate loop". I am using "shift+Enter" instead of Enter to avoid blanks but still such error appears. Can any one provide some rules which I should keep in mind to avoid these errors. My maple worksheet is enclosed-

invalid-if-stat-term-error.mw

Thanks and Regards,

Nilesh

Hi,

I am trying to execute a for loop for some repetitive calculation. For eg. i is varying from 1 to 10 and j is varying from 1 to 6. For each combination of i and j, I am computing  value of a function.  I got output for some initial (i,j) pair in for loop. After that, an error encountered and for loop interrupted( stopped). How can I tell maple to continue  for loop even when some error occurred for some combination of (i,j) pair. Maple can discard the output for which an error occurred and can continue the foor loop for the remaining (i,j) pair. For eg.

1) In for loop, I am using NLPSolve command and after giving some initial result it shows-

Error, (in Optimization:-NLPSolve) complex value encountered.

2) Similarly, in for loop, I am using DirectSearch[search] command and after giving some initial result it shows-

Error, (in DirectSearch:-Search) cannot find feasible initial point; specify a new one

Please guide me in this problem..

Thanks and Regards,

Nilesh

Hi,

I have a multi dimensional array ( 10 by 6 by 7) and I want to know How can I transfer the content of this three dimensional arrany into MS Excel. Is any procedure avaialbe for this?

Thanks and Regards,

Nilesh Asnani