# Zifeng Qiu

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Question

Forming limit diagram with strains

Hi, I was trying to recreate the forming limit diagram that was given from my professor, when strain3 is equal to 0.1, 0, -0.1 a...

3 years ago | 0 answers | 0

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answersQuestion

How to create a best fit line here?

I was trying to make a best-fit line with the data that I have, but for some reason the polyfit command doesn't seem to give me ...

3 years ago | 1 answer | 0

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answerQuestion

Steady-state value?

Is there a command or a way for me to find the steady-state value on this plot? I don't want to just assunming it by looking at ...

3 years ago | 1 answer | 0

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answerQuestion

How can I import multiple text files in my folder to Matlab?

I am trying to import all the text files to matlab and make it an array, I used the following funciton to read in all the text f...

3 years ago | 1 answer | 0

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answerQuestion

Why is my findpeaks function not working here?

I was trying to find the peaks of my wave output, but for some reason it's not working, I don't know why. vv = xlsread('1dat...

3 years ago | 1 answer | 0

### 1

answerQuestion

How can I add curves to the Bode plot?

I am trying to make a comparison between my experimental resutl and theoretical result, how can I move that blue curve to the ...

3 years ago | 1 answer | 0

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answerQuestion

How do I calculate the coefficients C in this function while P and T are given?

T=[4:4:24]'; P=[1e-4;2.5e-4;6e-4;1e-3;1.6e-3;2.25e-3]; plot(T,P) %find C with the given vectors

4 years ago | 1 answer | 0

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answerQuestion

How to calculate the jumper's final distance on this problem?

This is a Matlab Grader problem for calculating the jumper's final distance with given conditions. I wrote the code down below f...

4 years ago | 1 answer | 0

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answerQuestion

What am I missing here?

This is a Matlab grader problem for calculating the jumper's distance, I follow the code that my professor was provided, what am...

4 years ago | 0 answers | 0

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answersQuestion

What did I do wrong?

I am trying to solve the second question which is k in the given model, what did I do wrong? function [tv, uv] = RK4(f, u0,...

4 years ago | 0 answers | 0

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answersQuestion

What did I do wrong here?

I am trying to calculate the amount of fish I can catch in a year based on this model. What did I do wrong? The answer that I g...

4 years ago | 1 answer | 0

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answerQuestion

How to solve for k in this model?

I have a question about how to solve for the variable k in this model. Where RK4 is a function that I wrote before. u0 = 5...

4 years ago | 1 answer | 0

### 1

answerQuestion

How to solve problem 2?

This is a problem dynamics problem, how do I solve for the variable k in the function? u0 = 5000; % This is the answer to t...

4 years ago | 0 answers | 0

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answersQuestion

How to do this problem?

I am trying to solve this problem about population dynamics. It's asking me to model the population base on the model and the fu...

4 years ago | 1 answer | 0

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answerQuestion

What did I do wrong here?

u0 = 5000; lambda = 0.03; pm = 9000; k = 100; f = @(p) lambda*p*(1-p/pm)-k pf = RK4(f,u0,10,100)

4 years ago | 1 answer | 0

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answerQuestion

What am I missing here?

f=@(t,u) t*(u^.2-u+0.5); [tv,uv]=BE(f,1,10,100); function [tv, uv] = BE(f, u0, T, n) dt = T/n; % Differential of time. t...

4 years ago | 1 answer | 0

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answerQuestion

Why am I getting this Error Message?

I am trying to take the second order of central difference derivative of a set data that was provided, why did I get an error ...

4 years ago | 1 answer | 0