Access Matrix by row or column

12282017, 11:26 AM
Post: #1




Access Matrix by row or column
Is there a command to select a specific column or row of a matrix?
Ie in Matlab this works: A(3, : ) % Extract third row The colon is used as a wildcard. I cant find a way to do this on the Prime except using SUB(), but that requires you to enter lists containing start and end indices of selected region so is not as convenient as wildcarding. Actually, for a 2D Matrix, just using A(1) will select the 1st row ,but how to fo this for a column? I tried A(:,1) but this errors. 

12282017, 11:38 AM
Post: #2




RE: Access Matrix by row or column
col(M,n) and row (M,n) will do the job.


12282017, 11:48 AM
Post: #3




RE: Access Matrix by row or column  
12282017, 11:49 AM
(This post was last modified: 12282017 03:36 PM by salvomic.)
Post: #4




RE: Access Matrix by row or column
(12282017 11:38 AM)Arno K Wrote: col(M,n) and row (M,n) will do the job. yes. The Help mentions also the possibility to use an interval, but it doesn't give examples how to input the interval (both for row and cols)... You can also use some code like this one to get a "minor" (giving the row and col to delete: i.e. using minor(2,3) in a 3x3 matrix deletes row 2 and col 3 and returns a matrix with (1,1), (1,2), (3,1), (3,2) ... Code:
Salvo EDIT: how should input the interval in row() and col() in Home? In CAS it's ok row(M2,2..3), a standard way to input an interval: why not implement it also in Home? ∫aL√0mic (IT9CLU), HP Prime 50g 41CX 71b 42s 12C 15C  DM42 WP34s :: Prime Soft. Lib 

12282017, 08:19 PM
Post: #5




RE: Access Matrix by row or column  
12292017, 02:45 PM
Post: #6




RE: Access Matrix by row or column
(12282017 08:19 PM)JMB Wrote:(12282017 11:26 AM)Stevetuc Wrote: ..... Thanks, thats concise syntax! 

« Next Oldest  Next Newest »

User(s) browsing this thread: 1 Guest(s)