## # of variables in a polynomial?...

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Hello, everyone! Given a polynomial: f := x^2*y + 10*z*w + 2*a*t I would like to know how many different variables appear in f. Is there a command I can use to do this? My actual polynomial is more like: f := x[1]^2*x[2] + x[127]*x[3] + ... Any help would be appreciated! Thank you very much, and happy holidays! Best, Susan

## Poisson Distribution Values in Probability/Statist...

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I am new to the Maple v.11 world and trying to figure out how to do things. I'm getting lost with the instructions in the help screens. Here is the problem: Can somebody show me how to enter this into Maple. Find the probability of an observation falling within one standard deviation of the mean. A Poisson distribution with [lambda]=16. Two other questions are normal distribution with mean=20, and a gamma distribution with [alpha]=4 and [theta]=5. I'm sure that if I can figure out one of the problems, I can figure out the others. Somebody please show me how to enter the problem

## How can I..?...

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Hi I have data I want to fit it I do not know the model function I know only that the relation between X and Y is non-linear and there is six parameters I want to know their values from the fitting.can I do this using Maple or it is impossible. this is Maple work sheet: Download 7089_X0165.txt
View file details this is the input data: Download 7089_Nonlinearfit.mws
View file details

## Multiple function calls within Maple Addin...

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Is it possible to execute an fsolve() for the equation as given below? I have not been able to get it to work thus far. Thank you for your support. Excel cell formula: =Maple("fsolve(2*(2*EllipticE(&1)-EllipticE(sin(beta),&1)-EllipticK(&1))+2*EllipticF(sin(beta),&1)=tan(beta)*sqrt(1-&1^2*sin(beta)^2),beta);",I14)

## Does Maple have a built in function that will cacl...

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I have looked around and can't seem to find anything. Something simple that would provide the number of days eleapsed between two date/times. This comes in handy for radioactive source decay calculations. Thanks, GL

## finit sum of variables...

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I just started using maple I want to count such thing: ( sum {from j=1 to k} ( x_j - b ) - sum{ from i=1 to n}( y_i - b) )^2 It's a part of longer equation. As a result I need a formula not a value. It is possible to count it with a build-in maple command? I have problems with writing the sum. If not could someone give me a tip how to write a program?

## Calculating the domain and range of a function?...

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Hi, I need to find the domain and range for x=(1/5)*e^(y/2). How do I do that in Maple? Thanks!

## inconsisten numerical answers between evalf and pl...

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Hello, I have this complicated and messy (complex) function, called ratio, of a variable f0. (Sorry the function is really long). 1) suppose I set f0 = 5.0e9, then evalf(ratio) gives 0.3832106695. 2) if I were to plot ratio via, with(plots): plotr := semilogplot(ratio,f0=5e9..1e12,color=black,numpoints=1000,axis[1] = [tickmarks=[4,subticks=8]],axis[2] = [tickmarks=[4,subticks=5]], view=[1.0e9..1.0e12,0.40..1.00]): display(plotr); then on the plot it shows that ratio > 0.40 at f0 = 5.0e9. Could anyone help please? Thanks! The function is listed below, ratio := 0

## Embedded Components - 2nd Question...

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Hi, The Trainig video "Using Embedded Components with Maple 11" provides an example using a Button component, a Mathematical Expression component and a Plot component. Since the training video uses Maple 11, the commands in the Button component to get a function entered in the Mathematical Expression component displayed in the Plot component are not applicable if one has Maple 10. I have tried this example with Maple 10 using the SetProperty and GetProperty commands but cannot get this example to work. The command programmed in the "Action when cliked" filed of the button is as follows:

## Lists...

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I will have to use an example to highlight my problem, any help would be of great use, Let us take the group {a[1],a[2],a[3]} with a[1]=[1,0,1,0], a[2]=[1,1,0,0], a[2]=[0,0,1,1] now we have combinations of 2 such as a[1]+a[2]=[2,1,1,0], a[1]+a[3]=[1,0,2,1] and a[2]+a[3]=[1,1,1,1], I want to make Maple realise that a[1]+a[2] and a[1]+a[3] are the same as they have the same values in the list even though the order is not the same. from there I want to put them into seperate classes so I have b[1]={a[1]+a[2],a[1]+a[3]} and b[2]={a[2]+a[3]} Been having a lot of trouble trying to do

## Redefine the Del-symbol...

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I have made my own gradient function and now I wanted to redefine the Del/Nabla-symbol i 2D-math to use my function. But I can't get it to work. Any suggestions?

## Has vs. Depends...

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Hi, Can someone please explain the difference between "has" and "depends"? Can you give an example of where they are different? Thanks, Art

## Solving Equations & Expanding Brackets...

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Hi, I'm trying to complete two questions. One question is using maple 'to solve the following systems of equations': y=2x-5,y=2x^2+2x-21 I have entered the following code: solve({y=2*x-5,y=2*x^2+2*x-21},{x,y}); The output I get is this: {x = 2*RootOf(-2+_Z^2, label = _L14), y = 4*RootOf(-2+_Z^2, label = _L14)-5} I have no idea what this means apart from the fact that it's wrong but i'm not sure where I have gone wrong. The other question involves expanding the bracket (2x-3)^5 I've input: expand(2*x-3)^5; The output I get is: (2*x-3)^5 Surely this is wrong???!

## plot x vs y (both a function of T)...

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Hi Folks, I have to believe this is an easy one, but it stumped me anyway. I'm trying to plot an ideal binary VLE curve for two components, and I have equations that describe both my x term and my y term as a function of temperature and pressure. Using the normal plot command, I can get x and y vs. T (if I specify pressure), but how do I get x vs. y (specifying pressure) and either plot T on a second Y axis or ignore it. Thanks in advance. I have my simple worksheet available... Fred Vie

## Proving Divergence...

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Can someone help me to analytically show that the following series is divergent. sum(ln(1+(1/n)), n = 1..infinity) thanks, respectfully
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