Answered

lsqcurvefit initial values stays the same

Have a look the results below, it is curve fitting of complex function: Root of Mean Square Error (RMSE): 0.41174673299835 Sum...

lsqcurvefit initial values stays the same

Have a look the results below, it is curve fitting of complex function: Root of Mean Square Error (RMSE): 0.41174673299835 Sum...

4 jours ago | 0

Answered

My gamultobj nonlinear constraints are being ignored

The global solution: Objective Function (Min.): 680.630057374403 x1: 2.33049949480739 x2: 1.95137240931401 x3: -0.4775410075...

My gamultobj nonlinear constraints are being ignored

The global solution: Objective Function (Min.): 680.630057374403 x1: 2.33049949480739 x2: 1.95137240931401 x3: -0.4775410075...

6 jours ago | 0

Answered

Bad fitting result using lsqcurvefit

Baron, LingoGlobal, Antigone, 1stOpt, those packages don't need to guess starting-values anymore, but with much better outcomes....

Bad fitting result using lsqcurvefit

Baron, LingoGlobal, Antigone, 1stOpt, those packages don't need to guess starting-values anymore, but with much better outcomes....

11 jours ago | 0

Answered

Multi Objective nonlinear functions with unknown multi parameters

There are multi-solutions: 1: x1: 0.387245311047365 x2: -0.00972723068513297 x3: -40.2902696169456 x4: 18.9579782048437 x5...

Multi Objective nonlinear functions with unknown multi parameters

There are multi-solutions: 1: x1: 0.387245311047365 x2: -0.00972723068513297 x3: -40.2902696169456 x4: 18.9579782048437 x5...

20 jours ago | 0

Answered

Fit differential equation to a curve

Here the answers: k1 0.0094812101885331 k2 0.0140787217305701

Fit differential equation to a curve

Here the answers: k1 0.0094812101885331 k2 0.0140787217305701

22 jours ago | 0

Answered

how to fit 3d points with a non linear curve?

How about the fit function fellow: z = p1*exp(-0.5*(((x-p2)/p3)^2))+p4*exp(-0.5*(((y-p5)/p6)^2))+p7 Root of Mean Square Error ...

how to fit 3d points with a non linear curve?

How about the fit function fellow: z = p1*exp(-0.5*(((x-p2)/p3)^2))+p4*exp(-0.5*(((y-p5)/p6)^2))+p7 Root of Mean Square Error ...

22 jours ago | 0

Answered

What exactly is a StartPoint for a Curve Fitting Tool, its significance and how it works?

Curve fitting problems are actually optimization problems. The optimization algorithms used in curve fitting function (i.e. nlin...

What exactly is a StartPoint for a Curve Fitting Tool, its significance and how it works?

Curve fitting problems are actually optimization problems. The optimization algorithms used in curve fitting function (i.e. nlin...

22 jours ago | 1

Answered

Solving system of three non linear equations??

There are multi-solutions: No. x1 x2 x3 1 200 -1.99488627715356E-26 7.80083304370558E-9 2 200.000000001348 6.28318530721954 -...

Solving system of three non linear equations??

There are multi-solutions: No. x1 x2 x3 1 200 -1.99488627715356E-26 7.80083304370558E-9 2 200.000000001348 6.28318530721954 -...

environ un mois ago | 0

Answered

Multi Variable Non-linear Curve Fitting in MATLAB

Hi, Fahd , refer to the results below： Root of Mean Square Error (RMSE): 1.09231944926872 Sum of Squared Residual: 1355.431781...

Multi Variable Non-linear Curve Fitting in MATLAB

Hi, Fahd , refer to the results below： Root of Mean Square Error (RMSE): 1.09231944926872 Sum of Squared Residual: 1355.431781...

environ un mois ago | 0

Answered

Solving trigonometric non-linear equations in MATLAB

For the numerical calculation, there are infinitely solutions: No. x y z 1 -0.555653038054963 5.06016630687609 -92.05890654406...

Solving trigonometric non-linear equations in MATLAB

For the numerical calculation, there are infinitely solutions: No. x y z 1 -0.555653038054963 5.06016630687609 -92.05890654406...

environ 2 mois ago | 0

Answered

Problem of Nonlinear Regression

Hi, Kim, if take time t as x, temperature T as y, your model function looks like: y=t1+(x0/(1-exp(-c+b*x))-1)/a; However, you...

Problem of Nonlinear Regression

Hi, Kim, if take time t as x, temperature T as y, your model function looks like: y=t1+(x0/(1-exp(-c+b*x))-1)/a; However, you...

environ 2 mois ago | 0

| accepted

Answered

how to find the best curve fit for a set of data

this function is good enough: y = p1/(1+p2*exp(-p3*x))+p4; Root of Mean Square Error (RMSE): 3.46432941573129 Sum of Squared ...

how to find the best curve fit for a set of data

this function is good enough: y = p1/(1+p2*exp(-p3*x))+p4; Root of Mean Square Error (RMSE): 3.46432941573129 Sum of Squared ...

environ 2 mois ago | 0

Answered

solving 5 non linear simultaneous equation

one more solution: h: 10985.2739483926 bsfc: 1154.64304691955 k: 71.7260719049847 a: 11.9021369375982 b: 0.0167429176020812...

solving 5 non linear simultaneous equation

one more solution: h: 10985.2739483926 bsfc: 1154.64304691955 k: 71.7260719049847 a: 11.9021369375982 b: 0.0167429176020812...

environ 2 mois ago | 0

Answered

solving 5 non linear simultaneous equation

Look this result: h: -4113.26496133792 bsfc: -432.338129213572 k: 67.8689272162873 a: -18.7135929756326 b: -0.0604868803921...

solving 5 non linear simultaneous equation

Look this result: h: -4113.26496133792 bsfc: -432.338129213572 k: 67.8689272162873 a: -18.7135929756326 b: -0.0604868803921...

environ 2 mois ago | 0

Answered

Solving non-linear equations (0)

try numerical solution: lamda1: 1.48312225679967E-24 qp1: 54185.6537859035 qn1: -133.888674663691 qc1: 0.188502621518643 qk...

Solving non-linear equations (0)

try numerical solution: lamda1: 1.48312225679967E-24 qp1: 54185.6537859035 qn1: -133.888674663691 qc1: 0.188502621518643 qk...

environ 2 mois ago | 0

Answered

How to curve fit an equation with sigma function

Hi, where are the values of Z?

How to curve fit an equation with sigma function

Hi, where are the values of Z?

environ 2 mois ago | 1

Answered

Need to solve this

Hi， How about the results belows: a: 214.703486863113 b: -10.7034868631133 c: -0.00690634104047918

Need to solve this

Hi， How about the results belows: a: 214.703486863113 b: -10.7034868631133 c: -0.00690634104047918

2 mois ago | 0

Answered

How to fit a curve to a step function?

Hi, Swati, the model function below seems to be good: Root of Mean Square Error (RMSE): 0.0112392378141364 Sum of Squared Re...

How to fit a curve to a step function?

Hi, Swati, the model function below seems to be good: Root of Mean Square Error (RMSE): 0.0112392378141364 Sum of Squared Re...

3 mois ago | 0

Answered

How to fit a curve to a step function?

If possible, provide your data please!

How to fit a curve to a step function?

If possible, provide your data please!

3 mois ago | 0

Answered

Equation of nonlinear data

The model function below is good enough, also very simple: rA = 1/(p1+p2*x); Root of Mean Square Error (RMSE): 0.0002191789906...

Equation of nonlinear data

The model function below is good enough, also very simple: rA = 1/(p1+p2*x); Root of Mean Square Error (RMSE): 0.0002191789906...

3 mois ago | 0

Answered

Line search algorithm: nonlinear least squares method for fitting experimental data to a model

Hi, Kaouthar, the code changed to fellow, it ensures all parameters are postive, and the label of x_axis is your true xdata. How...

Line search algorithm: nonlinear least squares method for fitting experimental data to a model

Hi, Kaouthar, the code changed to fellow, it ensures all parameters are postive, and the label of x_axis is your true xdata. How...

4 mois ago | 0

| accepted

Answered

How can I forecast an integer related to other 5 numbers?

Use the model function below: y = p1+p2*x1*x2+p3*x1*x3+p4*x1*x4+p5*x1*x5+p6*x2*x3+p7*x2*x4+p8*x2*x5+p9*x3*x4+p10*x3*x5+p11*x4*x...

How can I forecast an integer related to other 5 numbers?

Use the model function below: y = p1+p2*x1*x2+p3*x1*x3+p4*x1*x4+p5*x1*x5+p6*x2*x3+p7*x2*x4+p8*x2*x5+p9*x3*x4+p10*x3*x5+p11*x4*x...

4 mois ago | 0

Answered

solve a non-linear least squares problem

only need to free the range of parameter "g" while keep other parameter ranges as originly, the result should be very good: Roo...

solve a non-linear least squares problem

only need to free the range of parameter "g" while keep other parameter ranges as originly, the result should be very good: Roo...

4 mois ago | 0

Answered

Fitting Question

How about the function below: y=y0+A*exp(-0.5*((x-xc)/w)^2)+A1*exp(-exp(-(x-xc1)/w1)-(x-xc1)/w1+1); Root of Mean Square Error ...

Fitting Question

How about the function below: y=y0+A*exp(-0.5*((x-xc)/w)^2)+A1*exp(-exp(-(x-xc1)/w1)-(x-xc1)/w1+1); Root of Mean Square Error ...

4 mois ago | 0

Answered

2D data fitting - Surface

The follow equation seems to be good, and simple enough: z = (x^0.5)^(p1/(1+y))+p2*x*y; Root of Mean Square Error (RMSE): 0.0...

2D data fitting - Surface

The follow equation seems to be good, and simple enough: z = (x^0.5)^(p1/(1+y))+p2*x*y; Root of Mean Square Error (RMSE): 0.0...

4 mois ago | 1

Answered

Curve fitting tool with 4 variables

Hi, Mahesh, if you don't care the formation of the fitting equation, try the follows: y = sin((((((p1-x3)^2)*x3)/(((x3^2)^(x2^p...

Curve fitting tool with 4 variables

Hi, Mahesh, if you don't care the formation of the fitting equation, try the follows: y = sin((((((p1-x3)^2)*x3)/(((x3^2)^(x2^p...

4 mois ago | 1

Answered

How to fix error of this type: "Failure in initial user-supplied objective function evaluation. FSOLVE cannot continue"

Hi，“z(2).z(1)” should be "z(2).*z(1)"

How to fix error of this type: "Failure in initial user-supplied objective function evaluation. FSOLVE cannot continue"

Hi，“z(2).z(1)” should be "z(2).*z(1)"

4 mois ago | 0

Answered

Improving fit of custom function

Hi, what is the function you want to fit? y= A+m*x+(B+n*x)/(1+10^(-((x-C)/D))) or y= A+m*x+(B+n*x)/(1+exp(-((x-C)/D))) if th...

Improving fit of custom function

Hi, what is the function you want to fit? y= A+m*x+(B+n*x)/(1+10^(-((x-C)/D))) or y= A+m*x+(B+n*x)/(1+exp(-((x-C)/D))) if th...

4 mois ago | 0

Answered

continuity of a fit function in different regions

Attach your data file please.

continuity of a fit function in different regions

Attach your data file please.

4 mois ago | 0