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# Alex Sha

31 2019 年以降の合計貢献数

#### Alex Sha's バッジ

Need to solve this
Hi， How about the results belows: a: 214.703486863113 b: -10.7034868631133 c: -0.00690634104047918

5日 前 | 0

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?

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...

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...

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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...

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...

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 ...

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...

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

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...

continuity of a fit function in different regions

Fit convergence to degenerated model - a reasonable expectation?
Hi，Dev-iL，theoretically，the SSE of f2 should be less or equal to that of f1, since f1 is the special case of f2, when b3=0. Als...

How to solve 4 equations with 4 unknowns with bounds?
Refer the results below: x1: 7.73410323214524 x2: 32.0801819920043 x3: 33.4573119565274 x4: 11.2688338748665

2ヶ月 前 | 0

Solving Multivar Non-Linear Regression from a Data Set
try the function below: z = (p1+p2*x+p3*y)/(1+p4*x+p5*y)+p6; where z: moisture content; x: temperature; y:humidity Root of Me...

2ヶ月 前 | 0

Fit convergence to degenerated model - a reasonable expectation?
Hi, I think you may make wrong calculation: with function of "f1(T) = A/( exp(B1/T + B2/T^2 ) + C )", the result is: R...

2ヶ月 前 | 0

solve a system of equations
There are multi-solutions: 1: x: -4.93419751895286 y: -16.1073500969731 r: 327.876127534353 2: x: -3.55619697118012 y: -8...

2ヶ月 前 | 0

How can i linearise this equation in matlab? y=a*x*e^b*x
by linearization, the results are： a: 9.66178585962543 b: -2.47330876570272 While if using nonlinear regression fitting direc...

3ヶ月 前 | 0

Multi-solutions (Parameter a is different): 1: Root of Mean Square Error (RMSE): 0.109662308225183 Sum of Squared Residual: 0...

3ヶ月 前 | 0

How to fit data to a Weibull bi-modal function ? nlinfit? lsqcurvefit?
please refer the results below: c1 6.93726775107201 c2 2.61789361078231 c3 5.06299442732144 c4 4.41925787462909 or: c1 5.0...

3ヶ月 前 | 0

Curve Fitting for Forced Damping

3ヶ月 前 | 1

Fitting multiple Datasets with shared and individual Parameters.

3ヶ月 前 | 0

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

3ヶ月 前 | 1

Non Linear Fit help?
For the fitting function: F = (((K.*(Vg-V).^(b+1)).^(-1))+R).^(-1); Obviously，should be: V < min(Vg) = 0, the reuslt may be: ...

3ヶ月 前 | 0

fsolve message "Equation solved, inaccuracy possible"
Multi-solutions: 1: x1: 1.00788811123075E-6 x2: 0.0083586258586415 x3: 0.0330975342164431 x4: 0.000243072462467804 x5: 4.2...

3ヶ月 前 | 0

problem solving nonlinear equation system with fsolve
here are solutions: x1: 1.80929329243556 x2: 1.67586180846898 x3: 1.19942316545143

3ヶ月 前 | 0

Non linear system of equations
multi-solutions: 1: x1 0.00357502545408908 x2 1.88403841412371 x3 3.32997281546349E-5 x4 2.49981876993596E-6 x5 2.40013395...

3ヶ月 前 | 1

Fsolve Error! Need help- Using Fsolve to solve system of non-linear equations.