kpassi

when I eval an expression at one x value it works but why does eval fail to work when multiple values of x are passed on to eval as a list....

a:=x^2

eval(a,x=9) will result in 81.

But eval(a,x=[9,10]) does not produce   81,100 .

I was under the impression that multiple values of x can be passed on as a list. Please let me know where I am making mistake(s). Thanks in advance !!

I am thinking about using Maple for my math calculations and work. Is Maple going to be around and vibrant since its acquisition by a Japanese software group? Just wanted to make sure I am not investing time and resources in a technology that might be phased out. Thanks in advance!

I need help with unapply command in order to create functions out of solutions produced by the solve command. For example, I want to solve ax^2+bx+c=0 and create a function out of the first of the two results. Thanks in advance!!

How can I use the eval command to evaluate x^2 at  [5,7]. I know how to eval x^2 at just x=5 or just x=7 but I am not sure how to evaluate the entire list [5,7]. Thanks in advance !!

what is the purpose behind the command gc()  ? Thanks in advance !!

Some time after I start using Maple 13 I notice that the scroll bar on the right is choppy. I also notice similar issues when I plot a 2D graph with the plot and the scroll bar becoming choppy. Could this be a computer memory problem? I am using Maple 13 on Windows XP with 1.25GB RAM. Thanks in advance !!

Please help me with function mapping.

I want to map 1/x over the list [2,6,8]. 

Thanks in advance !!

how can I find the average of numberrs in a list. For example, I want to find the average of [4,6,8]. Thanks!

How can I apply the function sin(x) to a list of numbers [4,6,Pi]? Thanks in advance!

I want to shade the region bounded by the curves x^2 and x^3 from x=0..1. Could you please help me with this. Thanks in advance!!

I am using Maple 13 for applications of Integratin. I want to plot region bounded by y=x^2 and line x=1. How can I do this in Maple? Thanks in advance!!

I used seq command to get a list of numbers......seq(2*x+8,x=1..10)...for example.

How can I take the output and convert it to a table? Thanks in advance.

I use the solve command to solve a quadratic equation. I get two outputs and want to assign the second output to the variable x. How can I do this?

Quadratic equation is 3x^2 - 9x+11

Thanks in advance!!

I will really appreciate some help with assigning solutions of the solve command to names. For example, when I enter the command...

solve( [3x + 9y=10,8x-7y=20],[x,y])

I get the following output:

[[x=250/93, y=20/93]]

How can I extract the solutions and assign them to x and y which I want to use in subsequent calculations such as ...

sin(x) + sqrt (y)

I use Maple 12 on a Macintosh platform. When I press command+ t   I switch to text mode. How do I switch back to 2D math input using the keyboard? Thanks in advance !!