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Alex Sha


40 total contributions since 2019

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  • 3 Month Streak
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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 -...

8 dagen 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...

22 dagen 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...

23 dagen 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...

24 dagen 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 ...

24 dagen 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...

24 dagen 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...

25 dagen 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...

25 dagen ago | 0

Answered
How to curve fit an equation with sigma function
Hi, where are the values of Z?

29 dagen ago | 1

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

ongeveer een maand 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...

2 maanden ago | 0

Answered
How to fit a curve to a step function?
If possible, provide your data please!

2 maanden 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...

3 maanden 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...

3 maanden 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...

3 maanden 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...

3 maanden 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 ...

3 maanden 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...

3 maanden 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...

3 maanden ago | 1

Answered
Curve fitting tool with 4 variables
Attach your data file please.

3 maanden ago | 1

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...

3 maanden ago | 0

Answered
continuity of a fit function in different regions
Attach your data file please.

3 maanden ago | 0

Answered
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...

3 maanden ago | 0

Answered
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 maanden ago | 0

Answered
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...

4 maanden ago | 0

Answered
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...

4 maanden ago | 0

Answered
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...

4 maanden ago | 0

Answered
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...

4 maanden ago | 0

Answered
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...

4 maanden ago | 0

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