# Harvey Rael

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**Feeds**

Is there a way to plot a contour with a 3-Dimensional matrix?

All have been helpful - I was being stupid. I think I can loop through the third dimension of the matrix, and keep hold on and c...

5 years ago | 0

Question

Genetic Algorithm - Case by Case Optimization

Hi All, I may be asking a stupid question, but is there a way to optimize on a case by case basis without needing to change t...

5 years ago | 0 answers | 0

### 0

answersQuestion

Is there a way to plot a contour with a 3-Dimensional matrix?

Hi, I've asked a lot of questions here recently but I am coming to the business end of my project and the stuff I am trying t...

5 years ago | 3 answers | 0

### 3

answersQuestion

Changing elements of an array by row and column using for loop?

Hi all, So essentially I am trying to correct some acos mistakes in an 180x40 array. I want to run through each element of th...

5 years ago | 1 answer | 0

### 1

answer[DEPRECATED] What frustrates you about MATLAB?

Has anyone tried to measure angles between a huge amount of vectors, by engineering convention? My first vector I need to mea...

5 years ago | 0

Question

Numerical instability of acos

Hi, I have a bunch of vectors that I wish to calculate the angle between in a 2-D case, but I am finding that where I know th...

5 years ago | 1 answer | 0

### 1

answerQuestion

How to change Crossover Function in GA midway through solving?

Hi all, I have a GA setup to search for a minimum of a problem. I think my problem is well defined, except it has many local ...

5 years ago | 1 answer | 0

### 1

answerQuestion

Minimizing a set of known values?

Hi All, I can attach the code I am working on if it helps but my question is more general than that. I am looking to minimize...

5 years ago | 0 answers | 0

### 0

answersQuestion

Relating outputs of parent function to inputs of nested function

Hi, I am going to try and explain myself simply in the hopes of getting a simple answer. Let's say I have a function 'calcula...

5 years ago | 0 answers | 0

### 0

answersQuestion

Plotting the left and right side of a tricky equation?

Hi, I am trying to find the intersection betweeen two sides of an equation that include some tricky trigonometric terms by plott...

6 years ago | 1 answer | 0

### 1

answerMinimum value of select cell elements?

I found a way to extract the values into a matrix, rather nicely for myself for those wondering. Appreciate all efforts that wen...

6 years ago | 0

| accepted

Question

Minimum value of select cell elements?

I have a cell array that is 20x50. And inside each cell, there is a 200x1 column vector. Of interest to me is the 200th element ...

6 years ago | 3 answers | 0

### 3

answersQuestion

Measure angles between two vectors solely counter - clockwise

Hi, I have two vectors and I want to measure the angle between them. The first one lies solely along the positive x-axis, and...

6 years ago | 3 answers | 0

### 3

answersNumerically integrating a symbolic equation in a for loop?

Fixed it - simply needed to flick the 'ArrayValued' setting in integral to true.

6 years ago | 0

| accepted

Question

Numerically integrating a symbolic equation in a for loop?

Hi! I'll try to explain qualitatively first what I am trying to do before then giving code. I have an equation that depends on a...

6 years ago | 2 answers | 0

### 2

answersQuestion

How to optimise a definite integral?

In the attached image, I want to optimize the function Dt, as I know the end result of the integral. I have expressions for k1 a...

6 years ago | 3 answers | 0

### 3

answersQuestion

How do I use GA to optimize the variables, while keeping the objective function at a certain point?

So, I have a function that contains 3 variables (for arguments sake x1,x2,x3) and I want to find the optimal values for the func...

6 years ago | 1 answer | 0

### 1

answerUndefined function or variable error even though function is saved

**Update** : MATLAB is a cruel mistress. I turned off my computer last night after many attempts (and after asking this question...

6 years ago | 0

| accepted

Question

Undefined function or variable error even though function is saved

Keep getting the message "undefined function or variable"..I'm trying to create this function to pass to a genetic algorithm to ...

6 years ago | 1 answer | 0