## 40 Reputation

6 years, 227 days

Thanks

## @acer  Hi acer. I have two questio...

Hi acer. I have two questions.

1- why did you put   *   between numbers and Units?

Thank you

## @mmcdara Thank you.Would you please...

Thank you.

Would you please introduce some sources for learning programming (especially write proc) in maple?

I searched before, but can't find anything that explains in details and also have lots of examples.

Thank you

## Eigenvalues of upper triangular matrix...

@hkim If your matrix is upper triangular then you can easily get eigenvalues. look at this

https://www.quora.com/How-do-I-find-eigenvalues-of-a-lower-triangular-matrix

@vv Thank you

## Using Pseudo Inverse definition instead ...

I changed some lines in my document and used Pseudo Inverse definition  (A+ = (A* A)-1 A* ) instead of  MatrixInverse  command. It is faster. I need somthing like this for calculating Eigenvalues.

2.mw

## @vv  Can I use parallel programmin...

Can I use parallel programming to speed up MatrixInverse and Eigenvalues commands?

## @dharr  I have a eigenvalue proble...

I have a eigenvalue problem like :  [FF1]*{x}=a^2 *[FF2]*{x} . I want to obtain eigenvalues (and eigenvectors), so I multiplty both sides of equation by [FF2]^-1 and get [FF2]^(-1)*[FF1]*{x}=a^2 *{x} then define [FF3]=[FF2]^(-1)*[FF1]. Now the eigenvalue problem is [FF3]*{x}=a^2 *{x}. Notice that the [FF1] and [FF2] are non-square matrices. considering these explanations , can I use LinearSlove to get [FF3]? Is it faster?

All the entries are numeric,[FF1],[FF2],[FF3] aren't sparse. can't reduce number of digits less than 30. just see end of the worksheet and leave the rest of it.

Thanks

## matrices size are variable....

@Carl Love Thanks for your response.

I use numerical method for solving equations and I need to study the results convergence for my project. size of [FF1] and [FF2] matrices is not constant.

I upload a sample of my work here. ( It is just one condition)

Note that Digits must be 30 or greater to get acceptable results. execute the document and see end of it.

1.mw

## What is T1P1 and T1P?...

What is T1P1 and T1P?

1.mw

2.mw

## @Carl Love I'm sorry. It was my...

@Carl Love I'm sorry. It was my mistake. I used copy-paste and that's the reason why both files have same error.

I hope you accept my apology.

## @Kitonum Thank you so much. It work...

@Kitonum Thank you so much. It works

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