Object behaviour in CAS programming - 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: Object behaviour in CAS programming (/thread-6405.html) Object behaviour in CAS programming - Tonig00 - 06-12-2016 01:13 PM Hello I just want to program an easy way to calculate de characteristic polynomial of a map. In CAS mode I do the first steps very easily, I will put an example: [[1 2],[3 7]]:=a // Asign the matrix to a variable "a" Then I check that another variable does not exist, like for example "t" Then I create an identity matrix of the same dimension as a and multiply by this variable: IDENMAT(ColDim(a))*t:=tId This product is done without problems because in CAS mode "t" is considered TYPE 8. But if I write a progrma doing this simple multiplication it does not work either for: 1.- If I delcare the variable as LOCAL then the value is 0 and the result obviously wrong. 2.- If I do not declre the program gives an error. Does some body knows how to avoid this problem? Thanks in advance for your help Just a little bug is sombody is interested: In Spreadsheet APP if you put in a column title: =coeff(expand(x+1)^row) then the calculator gives some extrange symbols or just blocked RE: Object behaviour in CAS programming - cyrille de brĂ©bisson - 06-13-2016 04:59 AM Hello, You have to do the operation in a CAS part of the program. You can declare a CAS section in a program by using the #cas and #end section. Cyrille RE: Object behaviour in CAS programming - Tonig00 - 06-14-2016 08:48 PM Thanks very much for your answer. I heve put this and it Works: #cas Su_Prop(m.l);= BEGIN LOCAL m1; m-(l*IDENMAT(COLdIM(M))):=m; return m; END; #end