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Alex Sha


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122 2019 이후 총 참여 횟수

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  • Revival Level 3
  • 6 Month Streak
  • Knowledgeable Level 2
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How to fit a custom equation?
If don't care the type of fitting function, try the below function, much simple but with much better result: y = b1+b2*x^1.5+b3...

1일 전 | 0

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Fitting a sigmoid curve using curve fitting tool box
Hi, Hair, the quailty of your data seems to be bad for sigmoid type of function. If take the function like: y = y0+a/(1+exp(-(x...

2일 전 | 1

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How can i solve the error "Reference to non-existent field 'xShape'. Error in finDiffEvalAndChkErr Error in finitedifferences'"
Hi, as my test, if c>0.367879, there is no solution for your equations.

7일 전 | 0

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Error fsolve undefined function or variable x.
taking initial start-values as: x0=[6 0.5 150]; will produce: x1: 5.96 x2: 7.50486851347978E-7 x3: 152.194203428967

11일 전 | 1

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Designing an iterative algorithm for a nonlinear system of equations
There are two set of solutions: 1 x1: 0.256953706774553 x2: -399.382730699003 x3: 0.0102597835062331 Fevl: 9.92301206481...

11일 전 | 0

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Solving a system of 5 dependent non-linear equations
My pleasure, it is actually very challenging problem, hard to be solved by common software or algorithms.

15일 전 | 0

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fsolve & linsqnonlin cant solve my equations
The unique stable results: x1: 0.231780000872077 x2: 0.040000000119062 x3: 0.508699999227432 x4: 0.00060000005989538 x5: 4....

17일 전 | 0

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Solving a system of 5 dependent non-linear equations
Hi, if vt = 0.0257, the solution should be: m: 512.891368076595 rsh: -1.08505661410065 rs: 3.40678689852078 io: 0.8568128664...

17일 전 | 0

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Solving a system of nonlinear equations with bounded variables
There are two solutions: 1: q_b: 0.305291000916417 q_v: 0.0179815487538954 q_lp: 0.237309452162523 y: 1.25168611470519 pr:...

17일 전 | 0

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Curve fitting with constraints
Hellow, Paul, if adding one more parameter in your fitting function, i.e. y = a*exp(b*x) + c*exp(d*x)+f Then: from y(0) = 0, w...

19일 전 | 0

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how to solve a system of non linear-equations
Hi, I get the solutions below: 1: r1: 0.0136978624480164 r2: -0.0529268624480211 c1: 23794.5028958407 c2: 1043438.64860562 ...

20일 전 | 0

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No solution found when solving 3 non linear equations
Hi, all, how about the solutions below, from the numerical perspective: 1: x1: -5.21219473201765E21 x2: -0.279500437676178 x...

22일 전 | 0

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Multiple equations solving in MATLAB
Hi, Golam, post out your problem, we may try.

22일 전 | 1

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8 nonlinear equations, 8 unknowns - little luck with fsolve/vpasolve
Hi, Alex Tekin, you may try some solvers or software package with the ability of global optimization, i.e. Baron, Lingo, 1stOpt....

22일 전 | 1

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Non-linear Multivariate regression using genetic algorithm
The GA toolbox in Matlab is not an ideal tool for curve fitting with the goal of global optimizatiom result. Refer the result be...

22일 전 | 0

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fminsearch for fitting a function to experimental data
There seem to be two sets of solutions: 1: Root of Mean Square Error (RMSE): 2.45406561689894 Sum of Squared Residual: 78.291...

23일 전 | 0

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What is "Equation solved,fslove stalled'?
There are two solutions: 1: x1: -0.000499999999999997 x2: -2.28184863820141E-18 2: x1: -2.52247055758755E-18 x2: -0.000429...

약 1달 전 | 0

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How can I find a correct value of the guess for my system of non linear equations ??
it is not easy to get correct initial start values, try to use global optimization algorithm instead of local ones like fsolve, ...

약 1달 전 | 0

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Constrained Global Optimization Problem with MultiStart, GA and HybridFunction using Parallel Processing
the best results: Root of Mean Square Error (RMSE): 69.3464929074478 Sum of Squared Residual: 577072.329427525 Correlation Co...

약 1달 전 | 0

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Failure in initial objective function evaluation. LSQCURVEFIT cannot continue.
Hi,Thaer Ismail, which is your exact fit function: "ydata=1-x1*exp(-(x2/xdata)^x3)" or "ydata=1-x1*exp((-x2/xdata)^x3)" ? if th...

약 1달 전 | 0

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Least Square Curve Fitting, finding the initial start values in lsqcurvefit function in Matlab
if " the second and third number are 0.2 and 0.4.", then the result will be much better: Root of Mean Square Error (RMSE): 0.01...

약 2달 전 | 0

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System of nonlinear equations
Hi,Mahboubeh, the results of your second case are much different with that of your first one, so in second case you use approxim...

약 2달 전 | 0

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How can i calculate five unknown parameters??
There are multi-solutions for Charalampos's problem: 1: iph: -12.4464463252524 io: -889977.402184639 n: -4891.45375599277 ...

약 2달 전 | 0

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I want to solve this equation. please help me
Here is the right solution, obtained from 1stOpt: a: -2.38880243947768E-9 b: 0.357245116257183 c: -32.3471147348507 d: -0.0...

2달 전 | 1

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Please help me to solve following equations using matlab
change the type of last three equations from (by removing denominator): 6.2975e-11 - (((x(6)^4)*(x(8)^8))/((x(4))*(x(5)^3)*(x(1...

2달 전 | 0

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Fslove don't find the right solution
I get the results: 1: q1: 31.25152 q2: -3.3648581278838E-15 q3: -37.1015437789933 2: q1: 31.2515200000001 q2: 1.378921962...

2달 전 | 0

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How to solve a nonlinear system of n equations
some results: 1: x1: 1.04727193704753 x2: 2.09481403258296 x3: -3.14176920919256 2: x1: -1.04719783053703 x2: 4.763975200...

2달 전 | 0

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Problem in using fsolve
Two of solutions: 1: x1 0.0302626794484622 x2 2.44987629792448 x3 -3.17840769482201 x4 -0.0245615818144686 x5 -0.291871074...

2달 전 | 0

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I have two equations that are difficult to solve, so I am using fsolve to get the sol. But while running the program I encountered the error .Please help me or tell other way to solve these equations.
there are two solutions: 1: F1: 0.458069398988435 f1: -1.13829069933547 2: F1: 0.280093672719386 f1: 0.0244403974479464

2달 전 | 0

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Why I cannot get a solution for this system?
A set of approximate solutions: lfd: 0.273760301072663 r1d: 0.0994325019367128 l1d: 0.236671205261253 l1q: 0.077183609924249...

2달 전 | 0

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