# Alex Sha

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**Content Feed**

How to constraint the values of fitted parameters with lsqcurvefit?

hi, the result is good enough Sum Squared Error (SSE): 0.0105245967805521 Root of Mean Square Error (RMSE): 0.01938758511131 ...

4 months ago | 0

curve fitting tool custom equation

if taking only part of data, for example, from No. 105 to No. 300, then the result will looks good Sum Squared Error (SSE): 111...

4 months ago | 0

The fsolve function fails to give me an answer for seven unknowns. What should I do?

Just doing some equivalent deformation (change division into multiplication), for example, form: f(5)=((x(1)^3)*(x(2))/(x(4)*...

4 months ago | 0

How to curve fit an equation that gets values from another equation?

How about the results below: Residual Sum of Squares (RSS): 34.9122402573179 Root of Mean Square Error (RMSE): 0.9585109100402...

6 months ago | 0

Unable to find explicit solution

One solution seems to be: t: -8.33315732250827

7 months ago | 0

Curve fitting with custom function

It is hard to get stable and unique result for Da125's problem, especially for parameters of "lambda" and "n". refer to the resu...

9 months ago | 0

FItting 3d with fourier

If taking the fitting function as: the result will be: Root of Mean Square Error (RMSE): 0.000481289122874164 Sum of Square...

10 months ago | 1

| accepted

FItting 3d with fourier

Hi, give your data as text format, not a picture just.

10 months ago | 0

PARAMETER estimation of kinetic and adsorbtion constant of langmuir hinshelwood haugen watson model

if want all parameters to be positive: Root of Mean Square Error (RMSE): 0.0035717712315911 Sum of Squared Residual: 0.0003572...

10 months ago | 0

How to obtain model parameters by fitting experimental data to the monod model. monod model.

Refer to the results below: Root of Mean Square Error (RMSE): 1.50437634361661 Sum of Squared Residual: 81.4733345963976 Corr...

1 year ago | 0

| accepted

curve fitting a custom equation

Hi, all, as mentioned by Walter Roberson, the resule I provided above is obtained by using 1stOpt, the biggest advantage, for 1s...

1 year ago | 0

| accepted

I want to solve 2 equations with 2 variables but it cant be solved and the command window shows fsolve stopped because the last step was ineffective

Hi, the result below should be one solution x1: -52.5485799573576 x2: 12.1032014174617

1 year ago | 0

How to solve a system of second order nonlinear differential equations with boundary conditions

Hi, the chart will be given automatically in 1stOpt UI, also you can make chart yourself by using the result data given above. 1...

1 year ago | 0

I need to fits the attached data as in image

Hi, the fitting function "y = p1/(1+Exp(p2+p3*x)+p4*x)^p5" is pretty good for all data set, where y=L, x=T 1: T1-L1: Root of ...

1 year ago | 1

| accepted

Objective function is returning undefined values at initial point. lsqcurvefit cannot continue.

The best results are as below, hard to be obtained since the initial-start values are impossible to be guessed reasonally. Root...

1 year ago | 0

| accepted

Kinetic parameter estimation and initial time setting

Hi, see the results below: Root of Mean Square Error (RMSE): 4.00513564326846 Sum of Squared Residual: 320.822230419589 Corre...

1 year ago | 0

How to include contratins on 1 variables for this nonlinear system of equations?

Hi, refer to the solutions below: 1: x1: 0.415757622422666 x2: 0.321911265108838 x3: 0.0970690621849188 2: x1: 12.98212823...

1 year ago | 0

Fit points and specify the slope at one of the points

Hi, try the function below: y = p1+p2*x^2-p3*exp(p4*x); to ensure the slope being 0 in point of "x=0.985035", should add a con...

1 year ago | 0

solving set of non linear equation

Hi, refer to the results below: phi1: 0.00687835881390378 phi2: 3.07608732711163

1 year ago | 0

Trouble finding solution of unknown variable in difficult integration problem

Hi, there are two solutions as below: 1: h=0.073660616949704 2: h=0.165217787421255

1 year ago | 0

fsolve is not returning the right solutions

Hi, if you think the solutions should be (1,0,1) or (-1,0,1) , then one equation: F(3) = 1 + 2*x2.^2 + x3.^2; should be: F(3)...

1 year ago | 0

Solving lengthy nonlinear complex equations in complex variables

Try to find numerical solutions as below; y1s.realpart: 11.0169967890388 y1s.imagpart: -125.141575853451 y3s.realpart: 7.8197...

2 years ago | 0

Lsqnonlin_Fitting Data

Hi, if possible, please post out your data of each curve, as well as the fitting equation.

2 years ago | 0

How to Fit a line to scatter data on scatter plot?

Hi, Chetan, if you don't mind the length of the fitting equation, refer to follow: x1=Speed, x2=Dp, y=Eff y = b0+b1*x1+b2*x1^2...

2 years ago | 0

Fitting a Custom Sigmoid

Hi，if the fitting function is： 1：y=a1*exp(-a2*exp(x)) Root of Mean Square Error (RMSE): 0.291990919479646 Sum of Squared Resi...

2 years ago | 0

| accepted

Options when drawing using the Curve Fitting tool

Hi, post your data and function in txt format, if possible.

2 years ago | 0

| accepted

How could I do simutanoues parameter fitting for two series experimental data and multiple datasets?

Hi, post your data please, if possible

2 years ago | 0

Using vpasolve to iterate/solve for flowrate in a piping network

refer to the result below: f1: 0.013713131883721 v1: 1.36937309476078 re1: 409175.227518161

2 years ago | 0

Solving set of 5 non-linear simultaneous equations using fsolve

Hi, Anahita, if you don't want complex answers, then there are problems in your eauqtions, here taking second equation as an exa...

2 years ago | 1

| accepted

Deconvolution of Guassian curve

Hi, you may try 4 Gauss Function: The results will be: Root of Mean Square Error (RMSE): 451.21462729511 Sum of Squared Res...

2 years ago | 3