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# Shuangfeng Jiang

Last seen: 4 meses ago Active since 2020

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Question

The most efficient way to do multiple summation in Matlab?
Hi Recetly I've got a problem about multiple summation calculation in Matlab. As the expression below shows, I would like to nu...

4 meses ago | 2 answers | 0

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Question

What does the argument 'TolFun' indicate in function 'fit'?
I would like to use the fucntion 'fit' to fit my data with the model, and there's the option called 'TolFun' which should be set...

alrededor de 1 año ago | 1 answer | 0

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Question

the 'fmincon' optimisation doesn't stop at minimum with all possible algorithms
I've got an constrained optimisation problem, thus I adopted the function ‘fmincon’. The curve of the f(x) is like the figure ...

alrededor de 1 año ago | 2 answers | 0

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Question

When the algorithm of Levenberg-Marquardt is preferred when doing curve fitting?
I would like to do a curve fitting, and there're 2 algorithms in the curve fitting toolbox. The trust-region is default,and it c...

alrededor de 1 año ago | 1 answer | 0

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Question

A bug of function fplot (the figure is inconsistent with the one got by 'plot')
syms t_d % input variable % the expression I would like to plot↓ f(t_d)=((6848549883207071*t_d)/70368744177664 + 619810600876...

más de 1 año ago | 1 answer | 0

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Question

Is there a function to plot a function with logarithmic scale like 'semilogy' does?
I would like to plot a function, and it seems that there's only 'fplot' that can do it as what I've got is just a function rathe...

más de 1 año ago | 1 answer | 0

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Question

How to build a symbolic function based on other symbolic functions？
As the codes shown below, I would like to build f4 based on f1 and f2, but an error occurred. syms x y f1(x)=x+1; f2(y)=y+2;...

más de 1 año ago | 2 answers | 0

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Question

Why did I get different results by using degree/radiance as the unit in the integration?
today I wonder if the unit (degree/radiance) of integration variable matters in Matlab, so I tried these 2 peices of codes: x_...

más de 1 año ago | 1 answer | 0