Community Profile # Alex Sha

22 2019 年以降の合計貢献数

#### Alex Sha's バッジ

• • 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

3日 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...

12日 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...

12日 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...

14日 前 | 0

fmincon with nonlinear equality constraints
Please try a software called "1stOpt": Codes: MinFunction x1+x2+x3+x4+x5+x6+x7; (1-x1)*(1-x2)=0; (1-x1)*(1-x2)*(1-x3)*(1-x6)...

14日 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...

19日 前 | 0

How to use multistart with 'fit' function
Multi-solutions (Parameter a is different): 1: Root of Mean Square Error (RMSE): 0.109662308225183 Sum of Squared Residual: 0...

20日 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...

21日 前 | 0

Curve Fitting for Forced Damping
Where are your data?

21日 前 | 1

Fitting multiple Datasets with shared and individual Parameters.
Hi, Fabian Bienen, if possible please upload your data here, I may try to solve it.

21日 前 | 0

Line search algorithm: nonlinear least squares method for fitting experimental data to a model
Please upload your data，I may try.

21日 前 | 1

fitting a parabola giving unreasonable answer
Note the part "b.*6.022e23" in the fitting function y = a.*exp(((-4.*pi.*b.*6.022e23)./(8.314.*1623)).*(((c./2.*(c-x).^2) - (1/3...

21日 前 | 0

fsolve message "Equation solved, inaccuracy possible"
if x should be positive， then the solution 1 should be answer. I use another software "1stOpt", the code is very simple as below...

21日 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: ...

23日 前 | 0

Parameter estimation using fminsearch and ode45
The "true" Global Optimization Algorithm does not need to guess initial start values of parameters, unfortunately, most of curre...

23日 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...

27日 前 | 0

Large system of equations, vpaSolve returning empty sym
one approximate solution calculated by another software called "1stOpt": aliq: 2.78633151012791E-7 bliq: 25.4564536830427 ava...

27日 前 | 0

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

27日 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...

27日 前 | 1

Fsolve Error! Need help- Using Fsolve to solve system of non-linear equations.
Hi， your equations seems to be Contradictory: "nc*(t1-t2)-(t1-x5)" lead to x5=381.7598 while "x5-(2.5^(.28571429)*t1)" lead t...

28日 前 | 0

How to solve a non-linear equation system as function handle with fsolve?
Multi-results: 1: q1: 2.96669036114669 q2: 1.70487333682449 q3: 15.5136953998108 q4: 5.27144773940526 q5: 0.14218964199662...

28日 前 | 0

How to fit experimental data on only one ordinary differential equations (out of multiple equations) with multiple unknown parametrs
Please refer the results from another software named 1stOpt: Root of Mean Square Error (RMSE): 1.42588687693147 Sum of Squared...

28日 前 | 0