+- 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: ΣLIST, ΠLIST and ΔLIST with vectors [SOLVED] (/thread-5612.html)
ΣLIST, ΠLIST and ΔLIST with vectors [SOLVED] - JMB - 01-30-2016 11:29 AM
Are these three functions intended to work also with vectors?
I've found that they have the following behavior, using firmware (8151):
- ΣLIST works well with lists and with vectors
- ΠLIST does not work with vectors. The HP Prime freezes, and restarts after a few seconds; the Windows emulator issues the error "The application has crashed and will be restarted"
- ΔLIST does not work with vectors. Both the HP Prime and the Windows emulator show a message error on the screen (white cross on a red circle), when in RPN mode, and "Error: bad argument type" when in textbook mode
RE: ΣLIST, ΠLIST and ΔLIST with vectors - DrD - 01-30-2016 01:02 PM
Do you have examples that don't work?
These vectors seem to work ok:
M1:=[1 2 3 4];
M2:=2*M1;
ΣLIST({M1,M2}); ==> [3,6,9,12]
ΠLIST({M1,transpose(M2)}); ==> [60]
ΔLIST({M1,M2}); ==> {[1 2 3 4]}
RE: ΣLIST, ΠLIST and ΔLIST with vectors - Didier Lachieze - 01-30-2016 01:17 PM
ΣLIST(M1); ==> 10
ΠLIST(M1); ==> restart
but:
ΠLIST(mat2list(M1)); ==> 24
RE: ΣLIST, ΠLIST and ΔLIST with vectors - JMB - 01-30-2016 03:45 PM
In my case, the direct use of a vector produces the error:
ΠLIST([1 2 3]) ==> restart
ΔLIST ([1 2 3]) ==> error
RE: ΣLIST, ΠLIST and ΔLIST with vectors - DrD - 01-30-2016 03:46 PM
(01-30-2016 01:17 PM)Didier Lachieze Wrote: ΠLIST(M1); ==> restart
Well, that's not very graceful, is it? To be fair, the help description does specify a list as the argument. Also, the function, "calculates the product of all elements in a list," and since there is no list, there are no elements to calculate, but one could surely imagine better ways to exit than simply, crashing...
RE: ΣLIST, ΠLIST and ΔLIST with vectors - JMB - 01-30-2016 03:57 PM
I agree with DrR, but the help description for ΣLIST says: "calculates the sum of all elements in a list", and the function also works for vectors.
ΣLIST({1 2 3}) ==> 6
ΣLIST([1 2 3]) ==> 6
RE: ΣLIST, ΠLIST and ΔLIST with vectors - DrD - 01-30-2016 05:23 PM
I think I read somewhere that the treatment of vectors and lists is generally the same. So ΣLIST([1 2 3]); should be the same as ΣLIST(mat2list([1 2 3])); and by extension, so should ΠLIST([1 2 3]) be the same as ΠLIST(mat2list([1 2 3])); so this seems like a valid bug and I know the team is aware of it.
-Dale-
RE: ΣLIST, ΠLIST and ΔLIST with vectors - Tim Wessman - 02-01-2016 04:55 PM
Is on the list. Thanks!
RE: ΣLIST, ΠLIST and ΔLIST with vectors - JMB - 04-29-2016 04:14 PM
Corrected in firmware 10077.
Thanks to the HP Prime Team!