Questions tagged [matlab]

MATLAB is a high-level language and interactive programming environment for numerical computation and visualization developed by MathWorks. Don’t use both the [matlab] and [octave] tags, unless the question is explicitly about the similarities or differences between the two. When using this tag, please mention the MATLAB release you're working with (e.g. R2017a).

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Reducing features to 2 by PCA confusion Matlab

I am trying to reduce $500$ features to $2$ as an assignment. I wrote the following code and I am deeply concerned if it is true as when I plot it on the graph it does not look good. It should look ...
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Performing 1D Depthwise conv using Keras 2D Depthwise conv

I would like to perform a 1D Depthwise convolution (ie the first step of the depthwise-separable convolution) for a machine learning model I am working on. This means that for an input activation ...
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23 views

Pixel labelled image is must for semantic segmentation using deep learning in matlab?

I have large set of CT images containing lung regions. But I don't have corrosponding pixel labelled images. So how I could do semantic segmentation using DL in matlab. Like a test program I created 6 ...
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differences in NN optimization algorithm between Matlab and Scikit-Learn

I'm trying to build a neural network to estimate the responses of a nonlinear system. My database contains 1000 load cases (inputs) and maximum responses (outputs) from numeric simulations. I'm using ...
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Algorithm for clustering worm-like points in a cloud

I have a cloud of points were I can clearly identify worm-like patterns in the cloud, along the Z-axis but embedded in the noise. My goal is to cluster the points that belong to the same "worm'. ...
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Problem in working out an example of SVM: mathematical steps

I am trying to code SVM from scratch using a small toy problem that involves five support vector values. In the code below, there are 5 support vectors arbitrary chosen and denoted by the variables <...
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11 views

K-means related question

I am a new user to Matlab kmeans and have the following question: I would like to use the following call from a Python application which is listed in this URL. ...
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27 views

Method of hyperparameter tuning for regression tree ensembles in Matlab

What regression tree ensemble methods and what parameters does Matlab actually consider in hyperparameter tuning? The documentation appears to be sparse, to say the least. See https://se.mathworks.com/...
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26 views

Results of quadratic SVM in Matlab are different from the results obtained in Python

I am trying to replicate a quadratic SVM classifier from Matlab to Python, however I am having different results regarding the accuracy. In Matlab the accuracy is 0.8955 meanwhile in Python the ...
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38 views

Looking for a machine learning algorithm that can classify line plots into two groups?

I have a dataset of many 2-D line plots that represent height versus position measured from an AFM. I am interested in training a model by classifying these lines into two groups: presence of a defect ...
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42 views

How to calculate the different metrics for multi class classification

My confusion matrix has the following structure: (Predicted) C= ( actual) [TN FP FN TP] How can I calculate the Mathews ...
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47 views

MNIST 2-layer NN failing to recognize certain digits

Recently I've been taking a look into some basic multilayer neural networks, and I decided to try tackling the MNIST database of handwritten digits using a 2 layer neural network with 100 neurons in ...
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How do I apply radon and iradon function in a 3D image

I am using matlab image processing , I have a 3DBodyphantom image of a CT scan which displays the axial,coronal and saggital slices, I am to apply to the image the radon function to get a sinogram and ...
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35 views

How to get used to matricial/vectorial operations?

I came to data science/machine learning from another background in computer science and i feel that i'm lacking of experience with matricial/vectorial operations. Python or Matlab, for instance, ...
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1answer
39 views

how to read emotion label of MSP-IMPROV dataset samples?

I need to read MSP-IMPROV dataset audio file's to conduct research. I read the help file that says 15th character of the file name, shows the emotion label of each utterance. For example: MSP-IMPROV-...
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81 views

Matlab - Exact Line Search

This is code for inexact line search: ...
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154 views

How to estimate tail distribution for computing Conditional Value at Risk in python?

How to estimate parameteres of generalized pareto distribution in python? 🙏 I solve the task of computing Value at Risk and Conditional Value at Risk. ...
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How to find the average over an area of center for a given radius

folks, I have an excel file which contains the lat and long values of the center of a Tropical Cyclone(TC). The excel file is as given below: Also, I have an NC(NetCDF) file which is of that of ...
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1answer
19 views

Optimization function returns the same optimal parameters for two labels

I've recently enrolled in the Coursera machine learning, and am working my way through making my own classifier for the Iris dataset problem using matlab. I'm training a classifier for each species (...
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looking for a correlation function for categorical + numerical datasets in matlab

I am looking for a function in Matlab that calculates the correlation coefficient of a data set that includes categorical + numerical data. I am quite surprised this isn't as straightforward as I ...
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Matlab Optimization. Meaning of warning: “The slope should be 2. It appears to be 1.”

I'm using the manopt package to solve some optimization problems in matlab. The problem is of the form. problem.cost = @(x) f(x) problem.egrad = @(x) g(x) After the problem definition, I check ...
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1answer
72 views

gradient descent diverges extremely

I have manually created a random data set around some mean value and I have tried to use gradient descent linear regression to predict this simple mean value. I have done exactly like in the manual ...
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17 views

Optimization problem with different type of constraints

I'm new to optimization problems. I want to find optimum values for my objective function. You can imagine my function as E = f(t1, t2, t3). I want to minimize <...
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I want to use a neural network for a control block in MATLAB, but without Simulink

I have a physical model that produces an error value after running, which I want to minimize by a Neural Network. I can not find a MATLAB function however that lets me run the program and use the RMSE ...
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Why normalize function has a different result on a matrix vs single value?

I have a matrix like: B=[ 1.5035; 1.5728; 1.6485; 1.5369; 1.5467; 1.572; 1.5374; 1.787; 1.5825; 1.6905]; Using normalize function like normalize(B,'range') ...
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Embedding git commit into the resulting data

Our pipeline works something like that: Collect bunch of raw data (10-100 GB) from microscope Process data using MATLAB scripts Change few parameters based on raw data, as well as add new features to ...
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1answer
56 views

kmean clustering

I am having a problem in Matlab. I would like to use kmeans clustering and then get the value and index of the centroid. For example, if there is an $5*5$ array, we do kmeans clustering where k=2 and ...
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1answer
272 views

Hyperparameter optimization performance comparison

I have used Bayesian optimization for hyperparameter tuning in a machine learning model. What is the best way to compare the performance of network with and without Bayesian optimization? I found some ...
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0answers
189 views

Using LSTM to forecast vehicle position - multivariate time series - Matlab

I am trying to train an LSTM model on Matlab to forecast the position of a vehicle when driving around a roundabout. My main concern right now is that my dataset consists of 4 features (X position, Y ...
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1answer
689 views

How to find the various matrix sizes in designing a CNN

I am trying to understand CNN especially the maths and working mechanism using Matlab as the coding language. I have few confusion regarding the concept and the associated programming and will be ...
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1answer
526 views

Tensorflow simple neural network has very bad performance in regression (curve fitting) problem

I'm trying to implement a very simple one layered MLP for a toy regression problem with one variable (dimension = 1) and one target (dimension = 1). It's a simple curve fitting problem with zero noise....
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1answer
47 views

Is it possible to change test and train data size when using crossvalind function with Kfold param?

I was looking at MATLAB Help and want to work with "crossvalind" function. It would two parameters that you can use it. If you use "HoldOut" you can define partition size of test and train data set ...
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1answer
35 views

Is there a common strategy to measure if a difference-significance of two areas under two ROC curves

I conduct sound detection experiments with mice. I have a stimulus sound and a "noise" sound that shoukd be ignored. I want to measure how well the mouse ignors the noise (with respect to, say, ...
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1answer
32 views

Why GA convergence curves continue as two parallel lines?

I'm working on a optimization problem and using GA algorithm (in MATLAB, ga function). As you know MATLAB plots GA result with two curves, one for the best values and other to show the mean values ...
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1answer
47 views

What method is recommended after outliers removal?

I have a data of mice reaction times. In every session, there are some trials in which the mouse "decides of a break" and responds after a long time to these specific trials. I was thinking ...
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21 views

Octave or python for implementing Machine Learning [closed]

When is the need to learn octave or Mat Lab for Machine Learning? Are these required if you are proficient in python?
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Why do the training curve fall sharp suddenly?

I am training a CNN classifier on a binary balanced dataset. The dataset has 4500 numbers of tweet data along with the class of the tweet. During training, I am applying, GLOVE embedding of 300 ...
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1answer
229 views

Why is my Python Altair chart printing a blank line?

Wondering if anyone can help me understand why python altair chart is not printing... I’m only seeing this when I run the code: It literally isn’t outputting anything. This is what my chart looks ...
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1answer
55 views

Feature selection method explanation

In the context of feature relevance, I am trying to understand the meaning of the correlation method for feature selection. Can somebody please explain if the following results of the correlation ...
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1answer
52 views

Modelling in python and scoring in MATLAB?

I have model objects either pickled object or H2O POJO. Is it possible to call those objects and do the scoring in MATLAB?
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75 views

How to implement loss function for CNN-SVM implementation

I am using Matlab R2018b and am trying to infuse svm classifier within CNN. My plan is to use CNN only as a feature extractor and use SVM as the classifier. I know people have already implemented it a ...
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1answer
337 views

What should I master better for professional data science in economics and finance? [closed]

First, excuse me for the noob and long question which is probably doesn’t even belong to here, I know there are several question been answered like this out there, but I think this is going to be up-...
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1answer
63 views

How to store a trained Random Forest model in python or matlab as a matrix

Is it possible to store a random forest model in python (or matlab). Then use that trained model in a C program? I am trying to do this because I am making a myoelectric prosthetic, and you can only ...
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2answers
59 views

Finding roots of a non linear expression when multiplied with a linear expression

Here is a simple polynomial equation: b^2 + 2b + 1 = 0 I could easily solve this as: ...
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20 views

Error using imread function in matlab code

I was doing some sort of speech recognition pattern for recognition of sound but I stuck at imread error in matlab, any advice what to change in picture below you can find code and error. Code Error ...
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23 views

How to develop this type of neural network? [closed]

I was given this task to develop, this type of neural network but I never done speech recognition and that type of recognition in Matlab, so could anyone please help and give some help about this task....
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2answers
251 views

Shouldn't an autoencoder with #(neurons in hidden layer) = #(neurons in input layer) be “perfect”?

I'm exploring autoencoders for the first time. I'm using the Matlab neural networks toolbox. I have created a synthetic dataset consisting of points in 2D space plus some noise. My idea was to ...
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1answer
49 views

What's the correct form of use the real coded genetic algorithm?

I'm new to genetic algorithms, but I haven't found specific info about real-coded GA's. I want to do antenna array optimization by using the real values of antenna position, phase, and amplitude, but ...
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309 views

How to find which features have been selected by PCA algorithm?

I used PCA function in MATLAB to decrease features on my data set. By this code I can reduce features from 12 to 8(as an example). It works good but my question is that how can I found with feature ...
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34 views

Does PCA decrease the feature on my Data set or just decrease the dimension?

I'm new in AI and sorry if my question is simple. I have a data set and want to use PCA to decrease the feature but after some research on the internet I'm confused about decreasing dimensions and ...