## Function that approximates some points better...

I have this points:

1; 2.58
3 ; 8.57
5 ; 15.00
10 ; 30.10
15 ; 45.00

I have to calculate the function that approximates them better.
I think it refers to a sort of trend line, but I don't know how it works with maple.
I tried with Excel, and and this is the result:

Do you think the method is right? How can I replicate it on maple?

```Thanks in advance
Enrico
```

## Inplace element-wise operations in rtables...

The map[inplace] operation can apply a function to the elements of an rtable, replacing these elements with the result.  Using map[inplace,evalhf] can be numerically quite efficient but I would like something more general.  For example

`x += x +~ v*~dt`

where += in some other languages denotes an inplace addition operation and x and v are Vectors (rtable). Is there a way to do this in Maple?

## How to get a numerical answer using the erf functi...

I didn't even know the erf function existed until doing this problem. I looked up how to use it, so I tried plugging in the explicity form into Maple, hoping it'd solve it, but it just spit back out the erf function.

I am trying to get a number answer.  A decimal. Because this is calculating a probability. How do I get Maple to give me a number here? Thanks!

## Analyse simple function, and plot...

Hello, How to do simple analyse on function? like find intervas where function negative and positive, monotone, critical points...

And also how to plot them on one graph?

thanks :)

## how to find roots of equation J...

how to find roots of equation J0(xR) = 0 ,R is constant, using maple? I know command for zeros of Bessel function i.e J0(x) = 0.  but what to do with different argument?

## How I can plot the following function?...

O(t) = 9.2-[(8.93*35.3)/(11.17-8.93)]*(exp(-8.93*t)-exp(-11.17*t))-8.3*exp(-11.17*t)

t betwen 0 and 1

## how to solve functional equation in maple...

```ha := (diff(c(t), t))/(c(t)*(diff(c(t), t))-c(t));
solve(subs(m=ha,f(m))*subs(m=subs(c(t)=a(t),ha)), f(m)) = subs(m=ha+subs(c(t)=a(t),ha), f(m), f);```

just expect to find a function ?

## creating functions with derivatives in them. How d...

I wish to define a function which is the derivative of another function.

> f:=(x)->x^2:

> g:=(x)->diff(f(x),x):

> g(x);

2 x

> f(2);

4

> g(2);
Error, (in g) invalid input: diff received 2, which is not valid for its 2nd argument

I cannot find a way in which I can define the function g, using the functional operator, so that I can actually evaluate g(x).

How can I do this?

## how I do to obtain the Real part and the Imaginar...

I have this function:

Z := (cos((1/2)*x)-I*sin((1/2)*x))*A0/r^(1/2)+(cos((1/2)*x)+I*sin((1/2)*x))*r^(1/2)*A1+(cos(3*x*(1/2))+I*sin(3*x*(1/2)))*r^(3/2)*A2;

I wanna to obtain another function Y which equal to

Y:=f1*(Re(Z)+Re(Z'))+f2*(Im(Z)+Im(Z'));

where: f1 and f2 are constant

thanks :)

## Iterated Functions...

how are iterated functions represented in maple? as in f(f(f(x))) is (x)  in conventional notation where by the reader knows it is refering to the iteration conducted 3 times on the argument x, but what does maple use to differentiate between iteration ,exponentiation and differentiation?

## How to specify undefined value for part of a piece...

Having a function where the value is for example only defined when abs(x) <= 1, then how can I specify that the value is otherwise undefined, the replacing "How_to_specify_undefined_value" below?

## How to make Explore bind 'a' value that is used in...

Below I want to explore a function behaviour using a slider to determine the value of 'a' so the function is shown in a plot, but I can't figure out how to use Explore to bind the value of 'a'.

If I bind bind the value using "a := 5", then plot works, but when binding through Explore it does not work.  I can also write the function in the plot like "a * x", but that is not as general as using a function.

How to explore function like that.

## Functions defined by a procedure...

Hi,

Let, fixed an integer i and 1<=j<=2^{i}-1, for each x and y in [0,1] let the following mapping

Then, with the above procedure we can obtained, for a fixed i, all the mappings for j=1,...,2^{i}-1

However, How can I to evalute the "components" of the above procedure? For instance, I can not to compute CreaF(2)[1](0.35,0.465) (i.e., the first function in the "vector" CreaF(2), in x=0.35, y=0.465).

Thanks very much for your time.