MAKEMAT - Printable Version +- HP Forums (https://www.hpmuseum.org/forum) +-- Forum: HP Calculators (and very old HP Computers) (/forum-3.html) +--- Forum: HP Prime (/forum-5.html) +--- Thread: MAKEMAT (/thread-1840.html) MAKEMAT - Alberto Candel - 07-16-2014 10:42 PM Does it work in CAS? it seems so according to Help. But MAKEMAT(I+J,2,2) returns [[0,0],[0,0]], while MAKEMAT(i^2+j,2,2) returns [[j-1,j-1],[j-1,j-1]]. This is so because upper case letters are initialized to 0, lower case are not initialized, and lowercase i is sqrt(-1). Any help? I cannot find any relevant documentation for this behavior in the user manual. Thanks. RE: MAKEMAT - Joe Horn - 07-17-2014 10:06 AM (07-16-2014 10:42 PM)Alberto Candel Wrote:  Does it work in CAS? it seems so according to Help. But MAKEMAT(I+J,2,2) returns [[0,0],[0,0]], while MAKEMAT(i^2+j,2,2) returns [[j-1,j-1],[j-1,j-1]]. This is so because upper case letters are initialized to 0, lower case are not initilized, and lowercase i is sqrt(-1). Any help? I cannot find any relevant documentation for this behavior in the user manual. Thanks. MAKEMAT (must be spelled with uppercase letters in CAS) only works with the built-in real variables I and J, not with lowercase user variable j (or any other variables). So when using MAKEMAT in CAS, be sure to spell both its name and its I and J variables in uppercase, or it won't work as expected. HOWEVER... Please note that makemat (spelled in lowercase) is a CAS-only function that uses a different syntax than MAKEMAT. In Home, makemat uses MAKEMAT's syntax (and is displayed in Home's history as MAKEMAT), but they are different in CAS: Home: MAKEMAT(I^2+J,3,5) --> [[2,3,4,5,6],[5,6,7,8,9],[10,11,12,13,14]] Home: makemat(I^2+J,3,5) --> [[2,3,4,5,6],[5,6,7,8,9],[10,11,12,13,14]] CAS: MAKEMAT(I^2+J,3,5) --> [[2,3,4,5,6],[5,6,7,8,9],[10,11,12,13,14]] CAS: makemat(I^2+J,3,5) --> [[0,0,0,0,0],[0,0,0,0,0],[0,0,0,0,0]] CAS: makemat((x,y)->x^2+y,3,5) --> [[2,3,4,5,6],[5,6,7,8,9],[10,11,12,13,14]] RE: MAKEMAT - Angus - 07-17-2014 10:55 AM Do we have the request for cleaning up the whole spelling/auto-correction topics in the bug/wishlist? That seems to be urgent ;-) RE: MAKEMAT - Alberto Candel - 07-17-2014 01:31 PM (07-17-2014 10:06 AM)Joe Horn Wrote:  CAS: makemat((x,y)->x^2+y,3,5) --> [[2,3,4,5,6],[5,6,7,8,9],[10,11,12,13,14]] Thanks, this is what I needed. BTW, the Prime rewrites "makemat" as "MAKEMAT" in textbook display. That was confusing.