Inverse Matrix

06282015, 05:01 AM
(This post was last modified: 06282015 05:02 AM by Lin Su.)
Post: #1




Inverse Matrix
Hi = )!
When i calculate the inverse matrix, i use inv(Matrix) and for small numbers(img.1), there`s no problem but when i try to calculate using large number(img.2)..it shows wrong result.. what am i doing wrong? 

06282015, 06:27 AM
Post: #2




RE: Inverse Matrix
(06282015 05:01 AM)Lin Su Wrote: Hi = )! large number is the image (2?) with [[4,5][6,7]]? its inverse is [[3.5,2.5][3,2]], correct. Or am I missing something? Salvo ∫aL√0mic (IT9CLU) :: HP Prime 50g 41CX 71b 42s 39s 35s 12C 15C  DM42, DM41X  WP34s Prime Soft. Lib 

06282015, 08:17 AM
Post: #3




RE: Inverse Matrix
(06282015 05:01 AM)Lin Su Wrote: Hi = )! (06282015 06:27 AM)salvomic Wrote:(06282015 05:01 AM)Lin Su Wrote: Hi = )! The images are displayed on the forum web page in reverse order. By "img.2" he means the image on the left. Lin: I typed your 5×5 matrix into my Prime, and it gets the correct inverse both in Home and in CAS. Could there be a typo in your input? <0ɸ0> Joe 

06282015, 09:17 AM
Post: #4




RE: Inverse Matrix
With the Excel matrix entered into M6, my results agree with Joe's, (I get the correct inverted values). Just for fun, notice the precision difference between inv(inv(M6)) function value, and (M6^1)^1.
Using the exponential form returns the original M6, while the inv() function returns a little less precision. Dale 

06292015, 10:28 PM
Post: #5




RE: Inverse Matrix
Hi Again X)
Thanks !! it was my typing mistake. You were right!!! . Salvomic, Joe Horn, DrD.. For give me for "stealing" your time = ( and Thanks again! 

06292015, 10:33 PM
Post: #6




RE: Inverse Matrix
(06292015 10:28 PM)Lin Su Wrote: Hi Again X) never mind, we are glad to help you! :) ciao ∫aL√0mic (IT9CLU) :: HP Prime 50g 41CX 71b 42s 39s 35s 12C 15C  DM42, DM41X  WP34s Prime Soft. Lib 

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