# Jesse Crotts

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I study Mechanical Engineering and Applied Mathematics. One of my biggest interests is in Number Theory.

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Question

How do you know how many inputs your lsim function has?

I know this seems like a dumb question because you should know by your system size, but I can't seem seem to get my lsim functio...

6 years ago | 1 answer | 0

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answerQuestion

What is Input for lsim?

When using the lsim function, the second variable to input is the "input" to the system. This seems very straightforward for a s...

6 years ago | 0 answers | 0

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answersQuestion

Proper way to use exist function.

I am using the ode23 function to call another function. The problem is that I need to change the time value each time the functi...

6 years ago | 2 answers | 0

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answersQuestion

How to solve system of 2nd order differential equations using ode23 or ode45.

I'm trying to use ode23 or ode45 to solve a system of 2nd order differential equations that look like this: [M]*xdotdot+[K]*x=[...

6 years ago | 0 answers | 0

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answersQuestion

How to assign a vector to multiple values.

I have these lines of code: function f = trick(t,x,M,K) f = zeros(4,1); f(1) = x(2); f(2) = x(3); Minvneg = -inv(M); [f(3)...

6 years ago | 0 answers | 0

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answersQuestion

How to simulate using ode23 with multidimentional second order differential equations

!!!At the very bottom, there is a much simpler version of this question!!! I am trying to model a beam using FEM in Matlab. I u...

6 years ago | 2 answers | 0

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answersI have graduated and am in graduate school. My license needs to be renewed. How do I do that?

I guess I bought the perpetual one. However, I bought a new computer so I need to download MatLab on it. How do I go about doing...

6 years ago | 0

| accepted

Question

I have graduated and am in graduate school. My license needs to be renewed. How do I do that?

How do I renew my student license?

6 years ago | 1 answer | 0

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answerQuestion

What does the Matlab student version have that the Matlab home version does not?

My MatLab student version will run out within the next year. I'm just wondering if I will have the same capabilities with the ho...

7 years ago | 1 answer | 0

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answerQuestion

Whats wrong with my code?

All I wanna do is plot a user input function. What's wrong with this? I'm new to function handles. So any extra tips would be gr...

7 years ago | 1 answer | 0

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answerSubmitted

Table Generator

This shows one of the most efficient ways to produce an function driven table.

7 years ago | 2 downloads |

Question

How do I make this 2 dimensional vector follow a formula

I want elements in a 2 dimensional vector two to follow a formula given its location (x,y) in the vector. For example, I want th...

7 years ago | 1 answer | 0

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answerQuestion

Does anyone recommend a solid state hard drive that will enhance MatLab's speed.

I use my computer mainly for Matlab, CAD, and gaming. Does anyone have a recommendation for a SSD that will enhance these 3 uses...

8 years ago | 1 answer | 0

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answerQuestion

I've been using a for loop with with mod functions to sieve number from the Natural numbers. Is there a more efficient sieve technique than this.

My Code looks something like this P = primes(100000); N = 1999900000:1:2000000000; for i = 1:numel(P); N(mod(N...

8 years ago | 1 answer | 0

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answerQuestion

I wrote a code to produce twin primes, however it is pretty strenuous for my computer and I need some high numbers to check a conjecture. Is there a better way to get twin primes. Note: these twin primes are represented by 6m's where 6m+-1 are prime.

n = 1:120000; m61 = n*6-1; Twins = []; for i=1:numel(m61); z = isprime(m61(i)); y = isprime(m61(i)+2); if ...

8 years ago | 2 answers | 0