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Brendan Hamm


MathWorks

270 total contributions since 2015

Profession: Training Engineer at the MathWorks.
Interests: Computational Finance, Stochastic Processes, Probability & Statistics, Optimization, Machine Learning and MATLAB.

All views expressed in my posts are my opinions and not necessarily those of the MathWorks.

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Answered
Random vector non repeated otherwise create new vector
p = perms(1:5); idx = randi([1,size(p,1)]); selection = p(idx,:)

11 days ago | 0

Answered
Is there a difference between declaring a class property "Dependent" versus "Dependent = true"?
There is no difference. For attributes which are binary (true/false) then just putting the attribute name is the same as togglin...

11 days ago | 1

Answered
GradientDescent algorithm returning error: left and right side different number of elements
I would put a break point on the line: error = ((hypothesis - y).^2); I would assume that the size of hypothesis and y are dif...

3 months ago | 0

Answered
Exporting a figure with an opaque legend box but no visible edge
You can modify this by setting the EdgeColor to none. set(Lgd,'EdgeColor','none');

3 months ago | 0

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Answered
fitcsvm decision boundary equation
Generate some data for the classes rng('default') n = 100; X = [2 + 0.5*randn(n,2);... 3 + 0.6*randn(n,2)]; Y = [zeros(...

4 months ago | 0

Answered
keep getting "too many output arguments" error while using the optimization tool box
Your non-linear constraint function needs to pass 2 output arguments back with the following calling signature: function [c,ceq...

8 months ago | 1

Answered
How many hours do MATLAB self-paced courses last about?
Each of the self-paced courses will show a "detailed course outline" on the course page. These will list the number of "days", w...

8 months ago | 1

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Answered
How do I make a polynomial regression of data points and afterwards calculate the prediction accuracy
I notice a few issues. Based on the second line of your portion, I assume that you mean to call the variable PressureDiffSquared...

8 months ago | 1

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Answered
How plot a matrix for Naive Bayes classifier?
The |heatmap| function was introduced in 2017a. The |imagesc| function will work though. To display the numeric counts you will ...

10 months ago | 0

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Answered
The is no 'linearFit' function
This is a helper function provided at the end of the documentation in the <https://www.mathworks.com/help/predmaint/examples/_...

10 months ago | 1

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Answered
Good coding practice / refactoring to remove multiple inheritance
1. There is no "best" practice as this depends on why you made the initial decision to perform multiple inheritance and then lat...

10 months ago | 0

Answered
Is there any way to generate code for nntool?
The nntool does not allow this, but you can generate the code for setting up and training a classification problem, which I assu...

10 months ago | 0

Answered
Problem with p-value calculation for Spearman's rho correlation analysis
I will notify the development team of your request. In the meantime, if anyone is experiencing the same issue, it may be worth e...

10 months ago | 0

Answered
How to create a loop that runs a function through subfolders in a directory?
You can get the sub-directories using dir: D = dir; % A is a struct ... first elements are '.' and '..' used for navigation...

11 months ago | 1

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Answered
the H and P value of standard normal distribution
The lillietest tests the null hypothesis that the *data* comes from a normal distribution against the alternative that it does n...

11 months ago | 0

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Answered
I am using Matlab R2016a. I want add alexnet but add on explorer not shown any thing what i do please suggest
You will need to upgrade to a new version of MATLAB as this was not released until R2016b.

1 year ago | 0

Answered
How can I post an order request via API?
Hi Fabio, Without a pair of keys myself I cannot duplicate the |auth| portion of this. I suspect this woudl be done with the ...

1 year ago | 0

Answered
Weight and Bias from a Neural Network
I'm not sure why you would get a 0x1 empty double column vector. You may need to post some code to help figure this piece out. ...

1 year ago | 4

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Answered
How to speed up code for converting an array of strings to array of numbers
I am not sure how much of a speedup to expect in the conversion, but I would highly consider using <https://www.mathworks.com/he...

1 year ago | 1

Answered
What is wrong with my while loop?
Your problem is that the result of X(:,:,1) == X(:,:,b) or X(:,:,1) ~= X(:,:,b) will return a logical matrix th...

1 year ago | 0

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Answered
how to parallelize separate matrix-matrix multiplications?
Unless you are working on a cluster, I would not expect to see any speed up from parallelizing such operations. The reason for t...

1 year ago | 0

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Answered
How to change XTick Labels in a heatmap
A |heatmap| stores the labels in the |XDisplayLabels| property. It is not a |matlab.graphics.axis.Axes|, but rather a |matlab.gr...

1 year ago | 1

Answered
How do i normalize data in neural networks ? feauture by feature or hole data in one step?
Yes. Data would be normalized feature by feature as it would not make sense to divide something in units of C by something in un...

1 year ago | 0

Answered
Non linear optimization using MATLAB
There is clearly an issue with the question as the provided solution does not provide a valid answer to the problem. That being ...

1 year ago | 0

Answered
how can i make alexnet accept 277x277x1 images
You can resize an image with the |imresize| function. Now since your images are of size 277x277x1 I will assume they are graysca...

1 year ago | 1

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Answered
Saving strings of different sizes in one variable
This is where the cell data type is used. names = {'folder1 xxx\name 1.txt';'folder2 xxxxxxx\name 2.txt';name_3 = 'folder3 ...

1 year ago | 0

Answered
runtime for t-copulafit
Your best option is to change the method for negative log-likelihood calculations. This is only recommended for large samples. ...

2 years ago | 1

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Answered
p values from correlation matrix using nancov
The corrcoef function accepts Name-Value pair inputs to handle missing data. [r,p] = corrcoeff(B,'rows','complete') ...

2 years ago | 1

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Answered
testing significan linier trend
If you are using a version equal to or later than 2013b than you can use the |fitlm| function which prints the relevant t-statis...

2 years ago | 0

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Answered
Monte Carlo for OLS histogram
You only ever assign to the 1st element of beta_hat. I think you need to recheck your code. 1. if you are intending to do |m|...

2 years ago | 0

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