HP 34S: Find an element in a matrix?

05222014, 05:36 AM
Post: #1




HP 34S: Find an element in a matrix?
Can someone please explain the syntax/function of MFD?
I need to find a given matrix element to implement Shanks square form factorization method. 

05222014, 06:10 AM
Post: #2




RE: HP 34S: Find an element in a matrix?
From the code I'd say: ( y mat > r )
Where mat is a matrix descriptor and y is the element you search. Cheers Thomas Code: /* Find a specified element in a matrix 

05222014, 06:51 AM
Post: #3




RE: HP 34S: Find an element in a matrix?
To post #2:
Thank you. I don't understand r. For 5,6,7,8 stored in registers 20 to 23 stack y: 55 x: 20.0401 returns 24.02301 and stack y: 7 x: 20.0401 returns 22.02301 Presumably the second result indicates "found"? How should this result be interpreted? 

05222014, 07:10 AM
Post: #4




RE: HP 34S: Find an element in a matrix?
You probably want the index of the element. The matrix descriptor is still in the last x register. Therefore you can use:
Code: RCL L 

05222014, 07:33 AM
Post: #5




RE: HP 34S: Find an element in a matrix?
To post #4:
Thank you & yes that is the info I needed. Will now get to work on Shanks SQFF. 

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