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HP 40gs, how to display variables in the variables form (not numbers)
01092020 04:35 AM
Hi!
I recently bought a secondhand calculator HP 40gs and even reading the user manual, I'm having some problems.
I would like to store two matrices in this form:
[sin(theta); cos(theta), sin(theta); cos(theta)]
[cos(theta); sin(theta), cos(theta); cos(theta)]
and then make the multiplication, willing to have the result in the form of
[sin(theta)cos(theta);.............]
instead of having the numbers shown.
The problem is that as soon as I fill the matrices with for example sin(T), it reads the T variable (which has not been yet defined, so it's considered =0) and in the matrix shows 0, instead of sin(T) literally typed.
Is there a solution to this?
Thanks in advance
Marco
01112020 12:10 AM  edited 01112020 12:29 AM
You have to use the "CAS" button and 2D editing screen. That is the only place in the calculator that does not automatically evaluate variables (AZ and Theta ARE predefined as 0 unless you have stored something in there). Are you doing things in teh CAS screen?
Although I work for the HP calculator group as a head developer of the HP Prime, the views and opinions I post here are my own.
01122020 04:25 AM
Hi,
First of all, thanks a lot for your answer.
I entered the CAS mode, but I can't find the 2d editing that you mentioned. Learning about the CAS from the user manual, I understood that for example in order to multiply the following matrices
1) {{S2+1,1},{3,5}}
2) {{S2+2,1},{7,5}}
I have to write, in the HOME folder
XQ({{S2+1,1},{3,5}})STO>L1
XQ({{S2+3,1},{7,5}})STO>L2
AXL(L1)*AXL(L2)
Anyway, it doesn't solve the multiplication, it shows
{{7+(S2+1)*(S2+3),......},{....,....}}
How can I make it so that it shows directly the solved products?
Thanks.
Marco
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