Function SUM

Go down

Function SUM

Post  JCAvella on Fri Sep 05, 2008 10:33 am

Hello,

I'have just begin testing this application, which looks great. But i got a question before buying the full version :

Is it possible to draw a 3d graph with with a SUM function, like

Z(X,Y) = SUM (from i=1 to X) of F(Y)
Where X is an integer
F(Y) = 1/(1+Y)^i

If not possible, do you have any idea where i could find an application able to do that?

Thx a lot

JCAvella
Guest


Back to top Go down

Re: Function SUM

Post  runiter on Fri Sep 05, 2008 5:46 pm

It is certainly possible to do SUM with this software Smile

Are you familiar with concept of recursive calls? Smart Math Calculator supports recursive calls and SUM is a special case of a recursive call. For example the Z(X,Y) = SUM (from i=1 to X) of 1/(1+Y)^i can be represented by:

Z(X,Y)=1/(1+Y)^X+Z(X-1,Y) for as long as X is more than or equals to 1. I attached a screen shot of the complete set of expressions that address your question here:



I'm also displaying the Z(3,2) which is SUM (from i=1 to 3) of 1/(1+3)^i
which is
1/(1+2)^1+1/(1+2)^2+1/(1+2)^3 = 0.4815

As you can see the program also calculates the Z(3,2) to be 0.4815

Is this what you wanted?
Also let me know if this way is too complicated. We could create a simple SUM function for the next version.

cheers,
Saeid
avatar
runiter
Admin

Posts : 132
Join date : 2007-12-05
Age : 37
Location : Boston, MA, USA

View user profile http://www.runiter.com

Back to top Go down

Re: Function SUM

Post  runiter on Fri Sep 05, 2008 5:54 pm

I showed you how to compute it using Smart Math Calculator, now here is the plotted graph in Graphing Calculator 3D:



Let me know if this the graph that you expected.
avatar
runiter
Admin

Posts : 132
Join date : 2007-12-05
Age : 37
Location : Boston, MA, USA

View user profile http://www.runiter.com

Back to top Go down

Re: Function SUM

Post  Sponsored content


Sponsored content


Back to top Go down

Back to top


 
Permissions in this forum:
You cannot reply to topics in this forum