# Items tagged with functionfunction Tagged Items Feed

### Defining this function...

September 26 2015
0 4

Hello

How do I define this function? s(t) = 5*t1/2

This function shows the pace of a particle. I have to decide the time when the pace of the particle is 2 m/s

help

### MatrixFunction with two matrices...

September 17 2015
0 7

Hi,

Is it possible to use the command MatrixFunction with two matrices as:

with(LinearAlgebra):

A := Matrix([[-13, -10], [21, 16]]); B := Matrix([[3, 0], [21, 16]]);

BesselY(A,B) ?

In the maple help we can do the calculation only for one matrix as:

MatrixFunction(A, sin(x), x);

Thank you

### How to define a function this way...

August 26 2015
3 4

Hello. My question is in the attached file.

Question.mw

### How to write a recursive function with two variabl...

August 23 2015
2 6

Dear All,

I am new to maple and trying to write a recursive function with two input variables, but when i execute the statement it shows error "Error, (in B) too many levels of recursion"

Following is the set of instructions which i am trying to execute:

if n=1 then

B(m,n):=omega(m);

else

B(m,n):=sum(omega(j)*B(m-j,n-1),j=1..m-1)

end if

After execution, i try to access B(1,1) or B(2,1), the following error occurs

B(1, 1);
Error, (in B) too many levels of recursion

I'll be grateful, if someone can help me to fix this problem.

### How do I perform numerical integration on an array...

August 18 2015
2 10

I have an arrays of data. One for x values, and one for y values. How can I obtain a numerical integration of y for a range of x values?

I have tried defining a function of X using ArrayInterpolation(x,y,X) and then calling evalf(Int(f,xmin..xmax)) but that gives an error message. (I don't seem to be able to paste into this window) The error message says

"Error, invalid input: evalf expects its 2nd argument, n, to be of type posint, but received numeric."

I thought I was using a form of the equation right from the help system.

I also tried the 2D version of integration, but it returns the difference of my limits times my function name.

I aslo tried AdaptiveQuadrature, but I can't get that to work either.

-Mike McDermott

Newbie Maple user

### Nonconsistent result after substitution...

August 18 2015
0 1

restart;
changering := proc(Equation1, f3,g3)
g1 := (x,y)-> f3;
f1 := (x,y)-> g3;
h:=subs(g=g1, Equation1);
h:=subs(f=f1, h);
h:=subs(0=0, h);
return h;
end proc:
Eq1 := f(x,g(x,y)) + f(x,y);
h2 := changering(Eq1,x+y, x+y);
h2;

g1 := (x,y)-> x+y;
f1 := (x,y)-> x+y;
h:=subs(g=g1, Eq1);
h:=subs(f=f1, h);
h:=subs(0=0, h);

### How to do these function compositions?...

August 17 2015
0 5

f(x, g(x,y)) + f(g(x,y), y) >= f(g(x,y), g(x,y))
f(x, g(x,y)) + f(x, g(x,y)) >= f(g(x,y), y)

f(x, g(x,y)) + f(x, g(x,y)) >= g(f(x,y), y)

f(x, g(x,y))*f(x, g(x,y)) >= f(g(x,y), y)

how to create a combinations of function of another function in maple

### Function depending on multiple variables - sensiti...

August 02 2015
1 4

I would like to get some sort of table (maybe also a plot) that shows me the effect on the function if I change a variable.

For example, I have f(x,y,z)=x+yz

Now I would like to get a list with the results for f if I run z from, say, -10 to +10.

Is it also possible to do this with all variables at the same time?

### How to convert into elementary functions?...

July 08 2015
2 11

Maple is providing answers with the gamma function and LambertW function.  I am not a math major.  Although I did take advanced engineering mathematics in grad school, I am not familiar with transcendental functions.

I did look at some of the help.  I tried to use the convert command to convert to elementary functions, however it did not help.  I looked at the definition for the Gamma function, GAMMA(z), and the upper incomplete Gamma function, GAMMA(a,z) that uses the generalized hypergeometric function 1F1.  Looking at the generalized hypergeometric function 1F1 defintion, hypergeom(n, d, z), it references the general pochhammer function, pochhammer(z, a), and product functions, product(f,k=m..n).  This all seems way too complicated.

eqn1:= R = exp(t/MTBF) * (t/MTBF) * sum(1/(i!), i=0..n);

eqn2:= MTBF = solve(eqn1,MTBF);

Is there any easy way to convert to use basic functions like sum, int, etc.??

I am wanting to use the answer in Excel.  I have found some custom Excel VBA code that I could use to implement these non-standard function in Excel, but that seems like a lot of effort.

Excel Add-Ins Incomplete Gamma Function (PC Review)

Update: Some more background on the problem is as follows. R is the expected reliability say 90%. MTBF is mean time between failures in hours. t is the time period of operation excluding allowable downtime. n is the allowed number of failures. I am looking to find the MTBF needed to achieve a certain required reliability, with the number of failures allowed, and the up-time operational period, being defined by the requirements as well.

To clarify the simplification does not necessarily have to be closed form, and an approximation would be acceptable. (in Excel I currently am using iteration over a number of rows, then using the Goal Seek tool to find the MTBF, however this is less than desirable to have to do everytime when looking at different trade studies) I am not that familiar with how to use assumptions in Maple, and do not know what would be the appropriate assumptions to make when simplifying. Thanks for your help.

### Set Uneval globally/ Simplification with unspecifi...

June 25 2015
1 5

Hello, i got the following problem. I have a function, say u(h,e) whith multiple exponents . As long as Maple does not know that u(h,e) is positiv it won't make the simplification and return u(h,e) as expected. From my view i have two possibilites to solve this problem:

1) Define u(h,e) to be positive. Sounds intuitive, but i didn't manage to find the right definition

2) Give maple the function e.g. u:=e+h^2 and simplify the epression in uneval quotes with assumption positive for e and h.

Whereas I have solution 2, the problem is that i would need excessive amounts of uneval quotes '' at the start of my worksheet, not to run out of them.

I definitly need my epressions in unevaluated forms and would be happy to hear any ideas.

Greetings, Fabian

### calculate values function.......

June 24 2015
0 7

Hi every body:

I have a problem with below function (f(x)), I will calculate values this function with for loop so that values are closer together. for example I will earn 10 or 20 data for this function so that they differences have to be fixed.my means is that I have 10 data like, 50,65,85,90,100,... no 50,100,170,... . that isn't important for me the data increase with constant value but my final data must be closer together. (the maximum number of my data to be taken is 50).

function is:

f:=(x)->(310*(z+0.5)^0.2)+70

z=[-0.5,0.5]

with regards...

Mehran.

### approximation by piece-wise constant function ...

June 23 2015
0 2

Hi

I am trying to approximate a function in terms of piece-wise constant function:

$$f(x) = \sum_0^N c_iB_i(x)$$

what modules/packages of maple are helpful here? thanks

### Error in integration when using an exponential....

May 28 2015
0 1

I am trying to integrate product of exp(t+s) and a piecewise polynomial but the result can not be read and not usefull. also I used numerical integration function "Quadrature" but the result did not change.

### Asymptotic behaviour...

May 21 2015
1 2

How to find asymptotic behaviour of a function.

For example at infinity

sinh(x) behaves as 1/2*exp(x)

1/sinh(x)  behaves as 2*exp(-x)

exp(-x)*(exp(-x)+1) behaves as exp(-x)

so that it works with a more complex expression.

### I forgot how to turn D or diff into a function......

May 14 2015
0 2

I googled everywhere for this and most results just tell me what diff and D does...

Basically I have a function, let's say

f:= x -> x^2

How do I turn the derivative of f into a function?

I tried

fprime := x -> diff(x^2,x)

But tihs just shows me diff(x^2,x), instead of x -> 2x

 1 2 3 4 5 6 7 Last Page 3 of 27
﻿