xinyu

Univ of Cambridge

Last seen: 5 years ago | Active since 2013

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numerical noise with exponential matrix (expm())
Some one told me that that numerical noise normally exists with the expm() function. The noise value is normally with a magnitud...

11 years ago | 0 answers | 0

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Question

expm() products NaN as answer.
I have the matrix A=1.0 e 04* 1.3371 0.0000 0 0 0.0130 -0.0000 0 0 0.0000 0 -0....

11 years ago | 1 answer | 0

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answer

Question

simplify the result from symbolic tool box
The following result is what I get from the symbolic tool box with the order pretty() and simplify(). How can I have it further ...

11 years ago | 2 answers | 0

2

answers

Question

draw picture with ezplot
Can I draw pictures with more than two variables with ezplot where only two variables are not constant. For example: syms ...

12 years ago | 1 answer | 0

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answer

Answered
How can I plot the following
What do you want to plot? vD VS. iD? plot(vD,iD)

12 years ago | 0

Question

integral of a function
I have an ans for integral calculation R = piecewise([1/(T*k) < 0, (E0/(T*k) - (E0*Inf)/(T*k))/(1 + Inf*(- infinity/(T*k) -...

12 years ago | 1 answer | 0

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Question

x0 in the fminimax
Hello, everyone. I'm using the fminimax to solve a minmax problem. Here are the unsure poits: * the initial guess seem effec...

13 years ago | 1 answer | 0

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answer

Question

Example code for fmincon error.
Hello, everyone. I was tryint to get the idea of using the function fmincon earlier. But when I run the example code in the hl...

13 years ago | 1 answer | 0

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answer

Question

how can I do linear programming with a piecewise objective function?
hello I have done a linear programming code.And now the objective function of the problem will become a piece-wise function, ...

13 years ago | 2 answers | 1

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answers