Help!I have no idea how to type the inverse Matrix and Matrix command.

[SpeedMath]

[kaarthikeyapreyan]

For working with matrices you could download and use the numpy module
and for finding out the inverse of a matrix of dimensions 2x2
you could use this for your personal computations

A = [[a,b],
     [c,d]]
inverse A = 1/det (A) [[d,-b],
                      [-c, a]]
where det (A) = ad - bc

[SpeedMath]

[SpeedMath]

For working with matrices you could download and use the numpy module
and for finding out the inverse of a matrix of dimensions 2x2
you could use this for your personal computations

A = [[a,b],
     [c,d]]
inverse A = 1/det (A) [[d,-b],
                      [-c, a]]
where det (A) = ad - bc

I am a beginner to use Python.
Can you teach me how to find the numpy module and download which particular part of it?
Thanks a lot.
I appreaciate you.

Regards.

[Laharl]

Google 'numpy' and the first result is the numpy homepage. There's download links there. I can't help you with using it, as I've never used it myself, though.

[jlm699]

Can you teach me how to find the numpy module.

You go to this little web site called Google.

At the top of the page is a search box, into which you enter your query (in this case NumPy).

The results will then be displayed; the first of which is NumPy's Home page

[SpeedMath]

Just now I found this reference.
http://numpy.scipy.org/numpy.pdf

I am encountering a problem.
I am using Python25.
In the Python25, I think I have lack of some library or something else.
Because I couldn't Run the below command.
Below commands adapted from http://numpy.scipy.org/numpy.pdf , page 84.



from numpy import *
from scipy import *


a = reshape(arange( 25.0), (5,5)) + identity(5)
print a

inv_a = inverse(a)
print inv_a

maximum.reduce( fabs(ravel(dot( a, inv_a)-identity(5))))


_______________ _______________ _______________ ______
The output stated this:

[[ 1. 1. 2. 3. 4.]
[ 5. 7. 7. 8. 9.]
[ 10. 11. 13. 13. 14.]
[ 15. 16. 17. 19. 19.]
[ 20. 21. 22. 23. 25.]]

Traceback (most recent call last):
File "C:/Python25/Scripts/project2.py", line 15, in <module>
inv_a = inverse(a)
NameError: name 'inverse' is not defined



_______________ _______________ _______________ ____

Why 'inverse' doesn't defined?

[SpeedMath]

Actually my Python 2.5 inside there got the "scipy.lina lg".
I think don't want to use that previous as my reference....
^^
It is a big discovery....

[SpeedMath]

I couldn't find any reference regards how to plot the wind vector field via google.
Can anyone helps me?
Thanks.