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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5 views
About the performance indexes for a regression model by non-parametric machine learning
I am new to machine learning (I usually use MLR to build models). I would like to know what are the performance indexes for a machine learning regression model.
RMSE?
MAE in %?
R2? (i noticed that ...
0
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0answers
11 views
Why FP-Growth is slower than Apriori?
My project is about Data mining (in MATLAB) and want to use Apriori and FP-GRowth to extract rules (Associate Rule Mining).
I read in somewhere on the internet, FP-Growth should be faster than Apriori ...
1
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1answer
26 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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0answers
9 views
How to generate artificial datasets in MATLAB based on behavior of real datasets?
To understand: Let's consider a scenario. I have real datasets of 2 buildings showing different behaviors of occupants. Now to expand the analysis for multiple buildings, I want to generate simulated ...
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0answers
11 views
How to handle variables with text and number?
This is a post with two related questions in one.
The first question is:
What is the correct procedure when I have variables with different kind of information? Imagine you have a column which has ...
0
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0answers
29 views
How to Compute Logistic Regression Cost Function?
I'm using MATLAB to calculate the Logistic Regression Cost Function, and I don't get the expected output when I test my code. My steps all seem to be logically correct. Can anyone please help me fix ...
0
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0answers
12 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
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1answer
25 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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0answers
32 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
202 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
24 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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0answers
9 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 (...
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2answers
32 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
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1answer
11 views
Estimating the value of b in a polynomial expression
How could I estimate the value of b in the given polynomial equation:
...
0
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0answers
20 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
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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
...
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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
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2answers
40 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
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0answers
28 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 ...
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0answers
18 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
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1answer
15 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
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1answer
37 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
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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
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2answers
30 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
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1answer
235 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
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3answers
76 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
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1answer
155 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 ...
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1answer
46 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?
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2answers
36 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 ...
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0answers
29 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 ...
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0answers
70 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
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0answers
95 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
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0answers
21 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
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0answers
145 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
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0answers
16 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
118 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
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0answers
17 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, ...
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0answers
104 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
195 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
58 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
49 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 ...
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0answers
58 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
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0answers
166 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
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1answer
433 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 ...
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0answers
234 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
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0answers
16 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
326 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
97 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
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1answer
42 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
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2answers
86 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 ...
