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programm in C to solve equations?
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prizmos


Newbie


Joined: 16 Jul 2012
Posts: 13
Posted: 11 Aug 2012 04:08:40 am    Post subject: programm in C to solve equations?
Hi all,

I want to have some equations saved on my Prizm with some text. Each equation can be chosen and solved. How can I accomplish this in C? Can it be easily done using "Solver" itself or a Prizm integrated function?

Can you please enlighten me?
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KermMartian


Site Admin


Joined: 14 Mar 2005
Posts: 55732
Location: Earth, Sol, Milky Way
Posted: 11 Aug 2012 06:13:00 am    Post subject:
You'll need a CAS, or Computer Algebra System. AHelper's gCAS2 is currently the CAS of choice for the Prizm, being designed to be small and lightweight and work despite a few missing stdlib functions in PrizmSDK. However, it's also a work in progress, and hence missing some features and capabilities. There are some open-source CASes out there that might be good to try porting, as well.
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prizmos


Newbie


Joined: 16 Jul 2012
Posts: 13
Posted: 11 Aug 2012 07:38:16 am    Post subject:
I can't find gCAS2 here. Where is it? Are there any instructions how to use it?
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KermMartian


Site Admin


Joined: 14 Mar 2005
Posts: 55732
Location: Earth, Sol, Milky Way
Posted: 11 Aug 2012 08:18:11 am    Post subject:
prizmos wrote:
I can't find gCAS2 here. Where is it? Are there any instructions how to use it?
It is somewhere inside Ahelper's repository at http://glassos.sourceforge.net . I also have a modified version good for the PrizmSDK.
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prizmos


Newbie


Joined: 16 Jul 2012
Posts: 13
Posted: 11 Aug 2012 08:54:36 am    Post subject:
I found only GlaßOS files on sourceforge, nothing about gCAS2. What about your modified version? Can you upload it?
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AHelper


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Joined: 30 Jan 2011
Posts: 1656
Location: Aufhelperstan, Utopian Republic
Posted: 11 Aug 2012 10:41:21 am    Post subject:
The GlaßOS project consists of the kernel, system apps, and other programs. From the top of my head, you can find the source of gCAS2 at http://glassos.svn.sf.net/svnroot/glassos/trunk/src/gCAS2/. You will also need KermM's additions for getting it to compile on the Prizm.
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prizmos


Newbie


Joined: 16 Jul 2012
Posts: 13
Posted: 11 Aug 2012 11:58:24 am    Post subject:
Quote:
It is somewhere inside Ahelper's repository at http://glassos.sourceforge.net . I also have a modified version good for the PrizmSDK.


Quote:
The GlaßOS project consists of the kernel, system apps, and other programs. From the top of my head, you can find the source of gCAS2 at http://glassos.svn.sf.net/svnroot/glassos/trunk/src/gCAS2/. You will also need KermM's additions for getting it to compile on the Prizm.


gCAS2 found, now KermM's additions missing...

@KermMartian: You wrote, you have a modified version. Where is it?
Is this what AHelper means with your additions?

Where can I find them? What's the next step?

Is there any chance that any of you developers to provide us newbies with a step by step guide here or even better to integrate the guide in the wiki?

Last edited by prizmos on 12 Aug 2012 04:40:29 am; edited 1 time in total
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KermMartian


Site Admin


Joined: 14 Mar 2005
Posts: 55732
Location: Earth, Sol, Milky Way
Posted: 13 Aug 2012 08:31:41 am    Post subject:
By the way, if it's been more than 24 hours and no one has responded, you are allowed to bump a topic by double-posting; it's not against etiquette. Smile I only have it locally on my computer and as part of a private Mercurial repository, but I can package up my current version and send it along to you. Would you PM me an email address at which I can reach you?

The additions and modifications I have are:

(1) Making gCAS2 work with PrizmSDK
(2) Implementing some of the trig functions (sin, cos, tan, atan)

AHelper would be a better guide to using gCAS2 than me, but I will show you a sample bit of code taken and modified from pieces of Graph3DP:


Code:
// Initialize equation and variables, get parse tree of equation
char* thiseq = "3*sin(X+2Z)";
memset(vars,0,sizeof(cas_var)*MAX_NUM_VARS);   //XXXX ? 2012-06-18 suggest removal
tree = gcas_parse(&thiseq,0,0,(cas_node*)CASERR_FIRST_PARSE,0,vars,MAX_NUM_VARS);
free(saveeq);

// Check if equation was successfully parsed or was poorly-formed
if (parse_is_error(tree)) {
   equations[i].valid = 0;
   printf("Invalid equation...");
   exit(-1);
}

// Set "X" and "Y" variables to val_x and val_y
if (0 > (id = gcas_get_var_id(vars, "X", MAX_NUM_VARS))) return -1;
if (0 > gcas_setvariable_float(vars,id,"X",val_x)) return -1;
if (0 > (id = gcas_get_var_id(vars, "Y", MAX_NUM_VARS))) return -1;
if (0 > gcas_setvariable_float(vars,id,"Y",val_y)) return -1;

// Evaluate the tree (plug in X and Y and simplify)
gcas_tree_eval(&tree, vars, MAX_NUM_VARS, lApprox | lBasic);   
                  
if (tree->type == nNUMBER) { //if the output was a number...
   printf("%f\t%f\t%f\n",val_x,val_y,tree->number.nN); //print it
}

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prizmos


Newbie


Joined: 16 Jul 2012
Posts: 13
Posted: 13 Aug 2012 09:25:23 am    Post subject:
and I was giving up hope...

Thanks KermMartian and AHelper, you are great!!!
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KermMartian


Site Admin


Joined: 14 Mar 2005
Posts: 55732
Location: Earth, Sol, Milky Way
Posted: 13 Aug 2012 12:32:52 pm    Post subject:
prizmos wrote:
and I was giving up hope...

Thanks KermMartian and AHelper, you are great!!!
Don't give up, we love to help. We just aren't always able to answer threads in a timely manner. For what it's worth, I open a bunch of tabs I need to answer, then sometimes end up re-editing the post I'm composing for days. I have two networking-related threads open in my browser that have been awaiting completed posts for four days, for instance. Smile
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