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Author Topic: Questions + Comments  (Read 3940 times)

Offline ju_n

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Questions + Comments
« on: September 21, 2009, 03:45:52 AM »
Hello, I'm new with PocketCAS and using it for Mathematics. I have an HTC Touch Cruise with WM6.1 and I could say it is a great software and has great features on it.

I have two questions to ask.

Is there a way to have a regular expression like 5cosx - 2x sinx and solve for several values of x like solve x=5, x=2, without having to type the entire expression with the numbers ???

I've been having some issues when trying to graph some functions, telling the following message:
Could not execute gnuplot properly

The functions I tried are:
x-ln(x)**x
5*cos(2x)-2x*sin(2x)

With more easier function like x**2-1 the graph will show correctly.

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Offline MrMage

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Re: Questions + Comments
« Reply #1 on: September 21, 2009, 09:45:28 AM »
I don't understand what you mean with solving.

For the plotting:

Replace ln with log and 2x with 2*x.
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Offline ju_n

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Re: Questions + Comments
« Reply #2 on: September 21, 2009, 09:56:46 AM »
Solving with numerical values for x like x=2, x=4.
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Offline MrMage

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Re: Questions + Comments
« Reply #3 on: September 21, 2009, 11:36:10 AM »
Try nSolve then.
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Offline ju_n

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Re: Questions + Comments
« Reply #4 on: October 01, 2009, 06:17:48 AM »

Is there any functions reference, I don't know how to use nSolve.


Thanks for your help  :)
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Offline ju_n

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Re: Questions + Comments
« Reply #5 on: October 01, 2009, 07:46:34 AM »
Found it!

The expression would be as this:


x:=5
eval(x^2-1)

24

 :D
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Offline wzydhek

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Re: Questions + Comments
« Reply #6 on: November 24, 2009, 09:58:10 AM »
How would I solve an equation such as:  2x + 7 = x + 18 to calculate the value of x using the PocketCAS? I know how to do it manually (on paper, simplify, etc...)
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Offline MrMage

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Re: Questions + Comments
« Reply #7 on: November 24, 2009, 09:49:58 PM »
Quote from: wzydhek on November 24, 2009, 09:58:10 AM
How would I solve an equation such as:  2x + 7 = x + 18 to calculate the value of x using the PocketCAS? I know how to do it manually (on paper, simplify, etc...)

If you are using the iPhone version of PocketCAS, please post in the specific forum. There also is a tutorial "Solving and Factoring Expressions" on the iPhone.

On windows mobile, use the solve() command.
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Offline wzydhek

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Re: Questions + Comments
« Reply #8 on: November 24, 2009, 10:22:09 PM »
I am using the Windows Mobile version. I have tried using the solve() function, but not sure how to use it correctly. Could you give me an example?
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Offline MrMage

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Re: Questions + Comments
« Reply #9 on: November 24, 2009, 10:26:18 PM »
solve(2x+7=x+18)
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Offline wzydhek

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Re: Questions + Comments
« Reply #10 on: November 24, 2009, 10:46:08 PM »
hmm. not sure why it didn't work for me before. Worked this time.

Silly question, where is the "Clear" type key? To clear everything?
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Offline MrMage

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Re: Questions + Comments
« Reply #11 on: November 24, 2009, 11:47:11 PM »
Quote from: wzydhek on November 24, 2009, 10:46:08 PM
hmm. not sure why it didn't work for me before. Worked this time.

Silly question, where is the "Clear" type key? To clear everything?

You posted three times already and did not once say thank you for this free software. Go find it out yourself.
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