Posts: 12
Threads: 5
Joined: Nov 2013
Is it just me, or does the HP Prime have inbuilt restrictions?
For example, the command
sum(1.0/x,x,1,1000)
returned
7.48547086054
almost instantly. All good. But the command
sum(1.0/x,x,1,10000)
returned instead
"Error: Invalid dimension"
This is annoying, unless there's some setting which will remove such errors. (I can do this sort of thing with zero problems on both the Casio ClassPad and the TI nspire.) I like many things about the HP Prime, but it keeps throwing error messages at me, or freezing, or sometimes spontaneously rebooting. There also seems to be a restriction on derivatives, as I explained in an earlier post.
Thanks!
Posts: 17
Threads: 0
Joined: Aug 2010
Some experiments later it's clear that 1000 is the precise upper limit for allowed sums. Starting with 1001, the HP Prime errors out. In Home with "invalid input", in CAS with "invalid dimension". What a shame!
Posts: 12
Threads: 5
Joined: Nov 2013
This is the sort of unnecessary restriction which (for me at least) severely limits the use of the HP Prime.
Of course you can get round this with
sum(sum(1.0/x,x,k*1000+1,k*1000+1000),k,0,9)
but that's too fiddly for simple (student) use. Drat.
Posts: 3,283
Threads: 104
Joined: Jul 2005
The limit seems to be a leftover from the 39gII implementation. It was inadvertently left in.
Posts: 12
Threads: 5
Joined: Nov 2013
Well, in that case I hope that in the next revision of the software they remove this restriction (and any others inadvertently left in)!