## How to do simultaneous fitting...

Dear All,

I am a new Maple user and I am still unaware of a lots of fancy features of Maple. I have a problem of simultaneous fitting polynomials. I wish that I could have help from you. Say, we have two polynomials of two variables,

f1(x,y)=a1+a2*x+a3*y+(a4+a5)*x2+(a4-a5)*y2;

f2(x,y)=b1+b2*x+b3*y+(a4-a5)*x2+(a4+a5)*y2.

Note that a4 and a5 are shared by the two polynomials. I would like to fit the two polynomials against their respective data set. Is there anyway I can do it using Maple? Any of your help is highly appreciated!

Best regards,

Toby

## nonlinear curve fit...

Dear Community,

I've made a nonlinear curve fit with the Minimize routine (see attachment). What would be an easy and elegant way to rerun the model (Model) with the fitted values of a, b, c and plot the result together with the measured points in the same chart? I'm stuck here.

best regards

Andras

BroSzem_Data.xlsx

Nonlin_Curve_Fit.mw

## Error when fitting function to data...

Dear Maple users

Physical experiment: I dropped a ball with low mass from a height of approximately 7 meters and wanted to test if the air resistance was proportional to the square of the velocity. I filmed the fall and used the program Logger Pro to collect data: a number of datapoints (time,height) was collected. I copy/pasted the datapoints into MS Excel, from where I could import data into Maple via Tools > Assistants > Import Data ... Then I wanted to make a fit with the theoretical solution, given by a function having just one parameter: the Drag coefficient. Unfortunately I received an error "complex values encountered" (see below). I can solve the problem manual by making a number of guesses for the drag coefficient, until the theoretical curve approximates the data points well. I wanted to make Maple do the fitting job, though. I will appreciate if someone could give an idea how to fit the data properly.

NB! Mass m and g is defined above in the Maple document. The Statistics and plots package is called too.

## How to get the coefficient values of a function...

I have a function fitted and found the coeffiecients, the coeffiecient values are found with data from maple

the function is: a*(x+b/c)

my result is 5x+15

How do I get the values of a, b and c? The value of a is 5 that I know, but how does I get that maple gives me all the values of a,b  and c? The problem is that I get one value while i need the values of a, b and c.

Thanks

## Fitting an equation for datapoints in 3d...

Ok guys, so i have a bunch of datapoints in 3d (x,y,z)

I'm trying to calculate an equation using maple that will express z as a function of x and y.

I've been browesing around for like 2 hours now with no hope. Help?

## Curvefitting for Data...

Hi. It is be good to be with you after 4 years.

I want to ask about Curvefitting for Data. If I have a numerical data and i want to find a function in x and y for these data.

## fitting multiple data curves...

i have a non linear equation that depends on three variables e, theta and z.

i have done calculations to calculate e while varying theta and z. theta varied among the vector [0, Pi/4, Pi/3, Pi/2] and z was varying between 1 and 20

when plotting my data it gives the following plot where z is represented on the x-axis and each curve correspond to one theta

i am currently able of fitting one plot to one equation i would like to fit the data points using the nonlinearfit function and to only get one equation for all the plots. is that possible in maple or not

## Problems creating a function...

Hey, I have some data points:

I than entered:

X := Data[() .. (), 1];
Y := Data[() .. (), 2];
f := a+b*x^c+d*x^e;
Statistics:-NonlinearFit(f, X, Y, x);
and when I entered Statistics:-NonlinearFit(f, X, Y, x);, It wouldn't output anything.

## Curve fitting spreadsheet data with an equation co...

Hello,

I am new to Maple.

I have a set of spreadsheet data :(x1, y1), (x2, y2) .....(xn,yn).

And I have an equation that contains an infinite series with unkowns.

e.g.) y=  A*x + sum ( B * exp(-n^2 * (x-C)) /n^2, n=1..infinity);

Where A, B, C are unkowns, which I want to get optimized values for the spreadsheet data fitting.

Sung Yeol

## Function (Could you do more clearly?)...

Find the function satisfying the following conditions:

f(-6)=2400,f(-4)=432,f(-3)=120,f(-2...

## Data fitting to SIR model...

Hey guys

I am currently working on my final project in high school. This project is about mathematical modelling within epidemology, and i am currently working on the mathematical models based on the SIR model.

The basis models for the SIR model were pretty easy, but i cant figure out how to fit data to my models. My first idea was to use the method of Leastsquare and/or Nonlinearfit, but i cant figure out how to do this in maple.

## Can anyone fitting this curve by simple math funct...

Dear All:

I have a curve about mosfet  Coss Vs. Vds . the detail math relationship can be found in the following picture:

Can anyone fitting this picture by simple math function.

PS: pls don't considering piecewise function

## Diagramm: Fit a function one some measured points ...

HI,

I measured some points. This points are plotted in a graph. Now I want to make a fit on this points.

I now that the fit-function has to be like this:

F = A + B1 x e^(-t/C1) + B2 x e^(-t/C2)

Problem: how can I create a fitting function like that?

The best thing I found is the "spline"-fit, but it doesn't work properly. It has to be one lonely function, not a summary of several functions (like spline).

## multinlinear least square data fitting...

Hi, I'm trying to fit an equation:

starting_salary= (intercept+SEX*B0) +B1*GPA  +B2* METRICS

(metrics,sex are  dummy variables, either 0 or 1) to see how sex coefficient affects the intercept ( how it affects starting_salary)

(later on I  want to see how metrics affects starting_salary for either sex=1 and sex =0 .. anyways I disgress)

STARTING_SALARY :=:

GPA:=:

METRICS: =;
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