HP Forum Archive 21

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HP Prime: adding an entry to a vector Message #1 Posted by Alberto Candel on 1 Dec 2013, 1:04 p.m. Hi, How do you add an entry to a vector (like going from [1,2] to [1,2,3])? ADDCOL for matrices does not work for vectors because (row) vectors are not matrices for the Prime (a matrix has at least 2 rows). And even if ADDCOL worked, it would not add an entry at the end of the vector. Thank you! Edited: 1 Dec 2013, 2:09 p.m. after one or more responses were posted

Re: HP Prime: adding an entry to a vector Message #2 Posted by Terje Vallestad on 1 Dec 2013, 1:56 p.m., in response to message #1 by Alberto Candel I think append will do it Example: append([1,2,3],4) gives [1,2,3,4] Cheers, Terje

Re: HP Prime: adding an entry to a vector Message #3 Posted by cyrille de Brébisson on 2 Dec 2013, 3:05 a.m., in response to message #2 by Terje Vallestad ADDROW(vector, value, column) will do what you want... cyrille

Re: HP Prime: adding an entry to a vector Message #4 Posted by Alberto Candel on 2 Dec 2013, 10:02 a.m., in response to message #3 by cyrille de Brébisson Thanks Terje and Cyrille, APPEND does what I wanted, ADDROW does not seem to work ADDROW([1,2],3,3) results in error. Same with ADDCOL.

Re: HP Prime: adding an entry to a vector Message #5 Posted by Terje Vallestad on 2 Dec 2013, 11:22 a.m., in response to message #4 by Alberto Candel Hi, From exprimentation and seeing other similar issues by others On this forum I think you need to enclose the 3 in tickmarks. I.e. ADDROW([1,2],'3',3) results in [1,2,3] ADDCOL([1,2],'3',3) also results in [1,2,3] Cheers, Terje

Re: HP Prime: adding an entry to a vector Message #6 Posted by Michael de Estrada on 2 Dec 2013, 11:42 a.m., in response to message #5 by Terje Vallestad What I've found is that you can't use matrix operations on a vector. A vector is designated by a single set of square brackets, e.g. [1,2,3], whereas a single row matrix will be [[1,2,3]]. If you do Shift 4 (Matrix), you will see the vector appear as dimension 3, whereas the matrix will appear as 1X3.

Re: HP Prime: adding an entry to a vector Message #7 Posted by Alberto Candel on 2 Dec 2013, 12:12 p.m., in response to message #6 by Michael de Estrada Yes, a matrix in the prime must have at least 2 rows, according to the user guide. The commands ADDCOL([1,2],'3',3) do not seem to work for me. Thanks.

Re: HP Prime: adding an entry to a vector Message #8 Posted by Michael de Estrada on 2 Dec 2013, 12:23 p.m., in response to message #7 by Alberto Candel It doesn't need two rows; it just needs two separate dimensions. So if you have a vector v:=[1,2,3], then v(2) would return 2, whereas in a matrix m:=[[1,2,3]], m(1,2) would return 2. Edited: 2 Dec 2013, 1:54 p.m.

Re: HP Prime: adding an entry to a vector Message #9 Posted by Terje Vallestad on 2 Dec 2013, 12:23 p.m., in response to message #7 by Alberto Candel Hi, I got it to work in Home, not in CAS Cheers, Terje

Re: HP Prime: adding an entry to a vector Message #10 Posted by Alberto Candel on 2 Dec 2013, 12:27 p.m., in response to message #9 by Terje Vallestad Ok, yes, it does work in Home. I was in CAS. thanks.

Re: HP Prime: adding an entry to a vector Message #11 Posted by Terje Vallestad on 2 Dec 2013, 12:21 p.m., in response to message #6 by Michael de Estrada Hi, I think you will find if you try using the additional argument enclosed in tick marks, you keep the vector format in the result even if you are using matrix commands Cheers, Terje

Re: HP Prime: adding an entry to a vector Message #12 Posted by Michael de Estrada on 2 Dec 2013, 12:37 p.m., in response to message #11 by Terje Vallestad But why go to all this trouble ? If you just stick with matrix form throughout, everything works fine and can be done in both Home and CAS view. Just like whenever I use CAS operations inside programs, which is basically the same as Home view, then I just place them inside a CAS(" ") command. Edited: 2 Dec 2013, 12:37 p.m.

Re: HP Prime: adding an entry to a vector Message #13 Posted by Alberto Candel on 2 Dec 2013, 1:18 p.m., in response to message #12 by Michael de Estrada Oh well, now I got it! This works ADDCOL([[1,2]],[3],3) gives [1,2,3] in CAS. Thank you all!

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