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).

0
votes
0answers
4 views

Analyse performance of NN

Matlab's train command internally splits the dataset into train,val,test: ...
0
votes
0answers
9 views

How can solve data imbalance issue in MATLAB for a PatternNet?

I have built a Pattern recognition NN in MATLAB. I have two datasets, one for training and one for testing each of 4500 samples. The number of classes is 3. Out of the 3 classes, class #1 has approx ...
0
votes
0answers
6 views

Improving ANN suggestions

I am interested in someones help, I have developed ANN in MATLAB by Fitting tool for Speech recognition, I have developed ANN which will record sound, extract MFCC features from recording then run ...
0
votes
1answer
20 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?
0
votes
0answers
24 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 ...
1
vote
1answer
81 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-...
1
vote
1answer
22 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 ...
0
votes
0answers
7 views

how to read all my audio file from one directory and store the outputs for all the files in one variable (matrix)

I would like to run the program over all the samples of audio file and store the output in a single variable. For example, if my folder is "audio" inside that I have 10 audio files (...
1
vote
2answers
31 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: ...
0
votes
1answer
9 views

Estimating the value of b in a polynomial expression

How could I estimate the value of b in the given polynomial equation: ...
0
votes
0answers
15 views

Implementation of Layer-wise relevant propagation in MATLAB from scratch

I'm having serious issues with the implementation of the LRP algorithm for neural networks in MATLAB. The challenge is to implement the equations correctly. I'm trying to implement the deep-Taylor $\...
0
votes
1answer
30 views

Feature normalization - proper way

Consider a matrix X where the columns are the attributes and each row is an example. There is no order of occurrence of the examples. The target variables are ...
0
votes
0answers
8 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 ...
1
vote
0answers
20 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....
0
votes
2answers
28 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 ...
0
votes
0answers
20 views

Implementing the simplest CNN, how to choose the first conv layer?

I'm working on a College assignment and I choose to implement an image classifier with Convolutional Neural Network using Matlab, I based this idea on this tutorials: How Convolutional Neural Network ...
1
vote
0answers
12 views

UnderBagging Testing in Matlab

I used UnderBagging for an imbalanced dataset with 45700 observation with 20 fetures. 45000 observations are 1 and 700 are 0. I used UnderBagging for classifier C ( for example for Decision Tree). I ...
0
votes
1answer
14 views

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

i'm new with the ga and i can't found specific info about the real coded ga, i want to do an antennas array optimization by using the real values of antennas position , phase and amplitude, but in my ...
0
votes
1answer
34 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 ...
0
votes
1answer
30 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 ...
0
votes
2answers
29 views

Linear regression incorrect prediction using Matlab

In the plot below the red crossed line is the actual curve and the crossed blue line is the predicted curve. I am using least squares for linear prediction. I have used 1:79 examples in training and ...
4
votes
1answer
219 views

Training a classifier when some of the features are unknown

I am training a classifier in Matlab with a dataset that I created. Unfortunately some of the features in the dataset were not recorded. I currently have the unknown features set as -99999. So, for ...
1
vote
3answers
70 views

Why are pandas/R/etc so common in a data scientist or analyst's workflow when one can resort to UDFs in an RDBMS?

It seems common for an analyst to have this workflow when using an RDBMS: use SQL to get a subset of data from the database, export it or use a connector, and then apply a data mining / model ...
0
votes
1answer
79 views

Advice on transitioning from Andrew Ng's Stanford Coursera Machine Learning (in MATLAB) into Python?

I'm currently finishing up Andrew Ng's Coursera course, taught in MATLAB/Octave, but I'm looking to code in Python. The course is an introduction into how some algorithms work from scratch. These ...
1
vote
1answer
36 views

Tuning C hyper parameter in Soft Margin SVM in Matlab

How to tune the C 'BoxConstraint' hyperparameter in soft margin SVM to get the best optimal value?
1
vote
2answers
28 views

Where can I find an algorithm for human activity classification using thigh and shank sensors?

I am working on a project where I initially need to classify the type of activity a subject is performing based on raw accelerometer and gyroscope data from the thigh and shank of both legs. The type ...
0
votes
0answers
19 views

Hard margin SVM in Matlab

How can I build a hard margin svm model using matlab builtin functions such as fitcsvm and fitclinear? Should I set the ...
1
vote
0answers
47 views

SVM hard and soft margins in matlab,

I am comparing the performances of several SVM models in matlab using the fitcsvm function, and I want to double check that I am using the correct syntax for hard ...
0
votes
0answers
77 views

SVM hyperparameters using Matlab's fitcsvm and OptimizeHyperparameters

I am building SVM models and will compare their performances, linear vs RBF, and I'm using OptimizeHyperparameters to get best hyperparameters C (BoxConstraints) ...
0
votes
0answers
20 views

DNN practice: errors and strange behavior

I've built a neural net for regression, with stochastic updates, for practice (shared below). It's having trouble modeling test data if more than one hidden layer is used. The test outputs are a ...
0
votes
0answers
89 views

Local Binary Patterns features using matlab 'extractLBPFeatures'

I am trying to understand the extractLBPFeatures function to extract the 59 uniform features, here is a simple code that extracts the 59 features from an image <...
0
votes
0answers
15 views

Local Binary features with unit16 images vs unit8 images

I have unit16 image dataset, and I would like to extract LBP features from it using the Matlab function extractLBPFeatures, which uses uniform LBP (59 features). ...
2
votes
2answers
83 views

Setting best SVM hyper parameters

I have a non linear data set, and I am using SVM (RBF kernel) to build a classification model, but not sure how to set the best hyperparameters of the SVM, C and gamma in Matlab ...
0
votes
0answers
14 views

Local Binary Patterns features

I have a dataset of images that differ in sizes, and when I extract the local binary pattern (uniform local binary 59 feature) from them I get several features as zeros, is it acceptable as features, ...
1
vote
0answers
81 views

Plotting ROC curve in cross validation using Matlab perfcurve

I have the following code for a binary classifying using SVM, and 10 cross-validation, ...
5
votes
2answers
133 views

Data Visualization with multiple dimension, and linear separability

I have a dataset of two classes with several features, how can I visualise such data using Matlab to decide if it is linear separable or not?
2
votes
2answers
51 views

Convolution Neural Networks on microcontrollers

I am wondering if an already trained convolutional neural network can be represented as a formula just like a perceptron can ($x_1w_1 + x_2w_2 + \ldots =$ PREDICTION). I know that the formula could be ...
2
votes
1answer
42 views

Is splitting the data set into train and validation applicable in unsupervised learning?

I am having a tough time implementing all the steps of setting up support vector machine (SVM) for unsupervised learning. My data set is labelled but for educational purposes I am learning ...
1
vote
0answers
42 views

How to create a timeline graph ( Date / time series) in MATLAB?

The data file is attached https://ufile.io/ttwi8.How may I create a timeline graph where my y-axis is the number of cases(Demand and prediction as sjown in attached graph) and my x axis is increasing ...
2
votes
0answers
140 views

How to implement Moving window with LSTM for Time Series Prediction?

I am trying to implement a moving window in my dataset. The window size=14 (for instance).After implemntinf sliding window how to prepare inputs and outputs for netwok? ...
1
vote
1answer
250 views

How do I use LSTM Networks for time-series classification problems?

I have 2 binary outputs (1 and 0) with time series data. The dataset order is shown in the image..Can anyone suggest me how to handle this problem with LSTM? Particularly in MATLAB or Python. Thanks ...
1
vote
0answers
173 views

convert 16-Bit to 8-Bit images

I am using matlab, and I need to convert 16-bit images to 8-bit images (tif extention) , and I used image = im2uint8(16bit_img); image = uint8(16bit_img/256); ...
0
votes
0answers
15 views

Open image saved using python in matlab

I want to save the image created by matplotlib in python in .fig format to open it for editing in matlab. But it seems that savefig(.) in matplotlib does not support .fig for saving. How can I save ...
2
votes
1answer
212 views

Training a convolutional neural network for image denoising in Matlab

I am currently trying to train CNNs to remove Poisson noise from images. The software I am using is Matlab 2018b, however the results I am getting are poor. I have followed the steps provided in the ...
2
votes
2answers
78 views

Accuracy differs between MATLAB and scikit-learn for a decision tree

Is there any possibility to vary the accuracy of same data set in matlab and jupyter notebook by using python code ? For same data set, at first I applied it in matlab and get 96% accuracy for ...
0
votes
1answer
37 views

Fuzzy rule based system: Should rules contain all inputs and outputs?

I am trying to design an FRBS using Matlab fuzzy tool box. The fuzzy system will be used to predict player's type based on the inputs and a set of rules defined by experts. I have 6 inputs and 4 ...
1
vote
2answers
66 views

Poor performance for unbalanced dataset

Consider a dataset A which has examples for training in a binary classification problem. I have used SVM and applied the weighted method (in MATLAB) since the ...
0
votes
1answer
366 views

How can I increase the number of iterations per epoch in MATLAB?

I am training a deep learning network using MATLAB and would like to increase the number of iterations per epoch. Using trainingOptions ...
1
vote
0answers
40 views

Using machine learning algorithm to approximate a matrix? [closed]

I don't know if this is a good question. I would like to use machine learning to approximate a matrix. For example, a very simple one as \begin{align} A=\begin{pmatrix} 1 &0 \\ 0& 2 \end{...
1
vote
1answer
72 views

How can I create a pixel labelled image for Semantic Segmentation?

I am following the Semantic Segmentation Examples tutorial by MathWorks. I understand that I can load pixel labeled images ...