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Problem with fsolve: system of 6 nonlinear equations and more
a stable results: thot_membrane 470.276797155953 tcold_membrane 470.271756744994 thot_out -727.941719280904 thot_coolingplat...

mehr als 6 Jahre vor | 1

Beantwortet
Trying to solve a system of equations with 14 equations and 14 unknowns
One result I got: a: 9.16543127083558 d: -3.41610736637613 v: 0.0215111341146459 re: -56206.8082673153 f: -0.00113861533204...

mehr als 6 Jahre vor | 0

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Solution to 8 non-linear equations.
for the case: a1= 4.8994; a2=5.143; a3= 4.09248; a4= 6.264; a5= 3.7584; a6= 2.81184; a7= 5.568; a8=4.176; g1=0.00001; ...

mehr als 6 Jahre vor | 0

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Solving the root of 5 equations with 5 unknowns.
Hi， Kaleb Crook， refer to the below results: x1: 0.0481826850207524 x2: 0.0410231263942099 x3: 0.0404768236956547 x4: 0.0777...

mehr als 6 Jahre vor | 0

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find a function that approximates a given set of data imposing conditions
If possible, attach your data please.

mehr als 6 Jahre vor | 0

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Can I use patternsearch to solve a system of non-smooth equations?
Ho, provide your 42 equations in details, so others may try to solve

mehr als 6 Jahre vor | 0

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How to curve fit following summation equation in MATLAB with given experimental data.
Hi， Yadav, I actually use a software package other than Matlab, named 1stOpt, it is much easy for using without guessing initial...

mehr als 6 Jahre vor | 1

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How to curve fit following summation equation in MATLAB with given experimental data.
d(K/ (1+exp(c-b*t)))/dt=k*exp(c-b*t)*b/sqr(1+exp(c-b*t)),so your fitting function become: is the above correct? if yes, you m...

mehr als 6 Jahre vor | 0

| akzeptiert

Beantwortet
How to curve fit following summation equation in MATLAB with given experimental data.
Hi, Yadav, in your function "a*d/dt(k/1+exp(c-b*t))", what is "d/dt"? does "k/1" equal to "k"? Please describe clearly.

mehr als 6 Jahre vor | 1

Beantwortet
Least square curve fit
The function of lsqcurvefit use local optimization algorithm, so it is too weak on fault tolerance, try to use global optimizati...

mehr als 6 Jahre vor | 0

Beantwortet
lsqcurvefit for global fitting gives bad parameters
Hi, I have just try to solve this complex fitting problem by using another math package, the result is as following, seems to be...

mehr als 6 Jahre vor | 0

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How to fit a quadratic equation to the experimental data by manipulating quadratic coefficients?
If you don't care the type of fitting function, try the following one: y = p1+p2*x+p3*x^3+p4/x+p5/x^2 Sum of Squared Residual:...

mehr als 6 Jahre vor | 0

Beantwortet
Exponential fit by customised equation
Hi, Sushreesmita Mishra, the problem you met is normal. When chose build-in function for data fitting, since "build-in", so Matl...

mehr als 6 Jahre vor | 0

| akzeptiert

Beantwortet
Problem by star values lsqcurvefit
Hi, Zuyu An, what's your exact data? xdata = [0 0.005 0.01 0.015 0.02 0.025 0.03 0.035 0.04 0.045 0.05 0.055 0.06 0.065 0.07 0....

mehr als 6 Jahre vor | 0

Beantwortet
lsqcurvefit fitting not good
whether fminsearch or lsqcurvefit in Matlab use local optimization algorithms, it is why the initial start values are so importa...

mehr als 6 Jahre vor | 0

Beantwortet
Fitting Monod Equation with ODE45 to data using lsqcurvefit function
Hi, Vinoj Liyanaarachchi, the code have been provided above alreadly, but note, that code is not for Matlab, but for another pac...

mehr als 6 Jahre vor | 0

Beantwortet
Fitting Monod Equation with ODE45 to data using lsqcurvefit function
The follow results obtained from 1stOpt may be used for comparison: Code: Variable t,x,s,p; ODEFunction x'=umax*s*x/(ks + s);...

mehr als 6 Jahre vor | 0

Beantwortet
curve of best fit from a few points
The equation below is good enough: y = p1+p2/(p3-x)^2; Root of Mean Square Error (RMSE): 0.000924797017843405 Sum of Squared ...

mehr als 6 Jahre vor | 0

Beantwortet
What function fits my data...?
The follow function is much simple, but more better: y = x/(p1+p2*x)+p3 Root of Mean Square Error (RMSE): 0.313525722040886 S...

mehr als 6 Jahre vor | 1

| akzeptiert

Beantwortet
Curve fitting by Genetic Algorithm
Rerfer the results below: Root of Mean Square Error (RMSE): 0.00353350868235726 Sum of Squared Residual: 0.00029965640659906 ...

mehr als 6 Jahre vor | 1

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Fsolve- equation solved, inaccuracy [possible
If want all are positive, refer the results follow: x1: 0.0990335590812945 x2: 1.27592369827812E-11 x3: 650.000000000022 x4:...

mehr als 6 Jahre vor | 0

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fitting scatter data into multiple cosine functions
So, an gao, what is the result you want? Unless you add range constraint for all parameters (except w), because there are trigon...

mehr als 6 Jahre vor | 0

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fitting scatter data into multiple cosine functions
Hi， how about the results below, the fitting is perfect, the reason for you cann't get good result is more possible the bad init...

mehr als 6 Jahre vor | 0

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Data fitting to the solution of coupled differential equation with all the different parameters.
if take initial conditions as: t=30,n=0.1178512,i=0; Root of Mean Square Error (RMSE): 0.00101378248364856 Sum of Squared Resi...

mehr als 6 Jahre vor | 0

Beantwortet
Is it possible to provide initial guesses in cftool?
Yes, it is possible if using global optimization algorihms (the curve fitting functions built in Matlab, i.e. cftool, lsqcurvef...

mehr als 6 Jahre vor | 0

Beantwortet
How to solve 4 equations with 4 unknowns using matlab
r1: 0.0269466666666667 r2: 2153.11111111111 r3: 2523.94560037811 r4: -2522.97254704477

mehr als 6 Jahre vor | 0

Beantwortet
How to solve 5 equations with 5 unknowns
Numercial solution: a: 9.00473933649289 b: 1.18483412322275 c: 3.55450236966825 d: 1.54545454545455 e: 17.2

mehr als 6 Jahre vor | 0

Beantwortet
How do I fit multiple curves with same fitting parameters?
How about the results follow： Parameter Best Estimate -------------------- ------------- b1 -1.42830819954452 b2 5...

mehr als 6 Jahre vor | 0

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Lsqcurvefit / Lsqnonlin to electrical model. Bad fit problem
Have a try with the results as below: Parameter Best Estimate -------------------- ------------- x1 30060.922855124...

mehr als 6 Jahre vor | 0

Beantwortet
Fit function and uncertainty
Hi, attach your data file please, if possible.

mehr als 6 Jahre vor | 0