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Questions tagged [matlab]

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0answers
7 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
10 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
25 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
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0answers
12 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
9 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 ...
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0answers
25 views

Training a convolutional neural network for image denoising in Matlab

first time posting in this stack exchange. 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. ...
1
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2answers
48 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 ...
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1answer
24 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 ...
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2answers
36 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
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0answers
19 views

Newton's method gradient and hessian formulation difficulties

Logistic regression Newton's Method Newton Method Lecture II In this picture the logistic regression cost function , Newtons Method and gradient and Hessian is defined. How to get this function that ...
0
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1answer
74 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 ...
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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
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1answer
26 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 ...
0
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1answer
39 views

Graphically Speaking - how weight vector is perpendicular to hyperplane

why-is-weight-vector-orthogonal-to-decision-plane-in-neural-networks vector-orthogonal-to-hyperplane I wanted to visualize this by drawing a 3d plane where and the weight vector. By definition of ...
0
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1answer
26 views

Higher dimension data visualization in Matlab/Octave

I am working on sparse recovery for a classification task. I use Pine hyperspectral dataset which is a freely available dataset and this image contains 200 Dimension (Depth/channels/bands). In ...
1
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2answers
50 views

why nobody uses matlab [closed]

I wonder why most people now don't use matlab. I guess the reason is matlab is not free, so companies don't want to use it, then interviewees don't use it, then schools don't encourage it, then nobody ...
0
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1answer
24 views

Why the results from Matlab curve fitting function differ when using custom equation?

I'm using Matlab's curve fitting app, When I select Power fitting it returns values which perfectly describe the data but when I use the custom equation and enter ax^b as the equation it returns very ...
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0answers
91 views

How does `cvpartition` in Matlab work?

I have split my entire dataset X and the label set Y into Xtrain_val and ...
1
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1answer
33 views

Problem with calculating error rate for KNN

I am trying to validate the accuracy of my KNN algorithm for the movie rating prediction. I have $2$ vectors: $Y$ - with the real ratings, $Y'$ - with predicted ones. When I calculate Standard ...
1
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0answers
32 views

How can I combine images for Matlab deep learning?

I have a data set which consist a number of instances (of two-three different classes), and for each instance I have a handful of monochrome images. This handful of images have different resolutions (...
2
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0answers
196 views

Matlab: setting static iterations per epoch in a CNN

I'm building a convolutional neural network using Matlab's neural network toolbox. I have code designed to cross-train the network with different data sets, using the previous network's layers in ...
0
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0answers
92 views

Logistic Regression sklearn vs matlab Different Answers

Years ago I built a model in Matlab that used glmfit(X, Y, 'binomial, 'link', 'logit') and I am now trying to transfer the model to python using sklearn (i.e sklear.linear_model.LogisticRegression). ...
1
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1answer
187 views

Poor performance of SVM after training for rare events

I found out that Weighted SVM is a classification approach to handle class imbalance problem. My data set is highly imbalanced with rare event (minority class, labeled as 1) and the majority class (...
0
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1answer
58 views

Confusion regarding classification accuracy calculation and result

The total number of data points for which the following result is obtained = 1500. Out of which, I have 1473 labelled as 0 and the remaining 27 as ...
4
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3answers
282 views

Which Format is Faster, Matlab (.mat) or NumPy (.npy)?

I am working on a deep learning problem to detect cancer in images of size 250 x 250. I have hardware limitations and I have been running out of memory. I decided to convert my images to Matlab ...
1
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2answers
190 views

Terminology - cross-validation, testing and validation set for classification task

Confusion1) If k=10 then does this mean that 90% is for training and 10% for testing? So always we have k% for testing? ...
0
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2answers
104 views

Is ensemble learning using different classifier combination another name for Boosting?

For implementation I am following the Matlab code for AdaBoost. Based on my understanding, AdaBoost uses weak classifiers known as base classifiers and creates several instances of it. For example, a ...
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0answers
16 views

correspondence analyses in matlab to show presence/absence data in different locations

In MATLAB, I want to plot a PCA-type plot (I think) to show presence/absence of species in different locations so that points ...
4
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2answers
194 views

How to make sense of confusion matrix

Consider a binary classification problem with 0 labels denoting normal and 1 abnormal or rare. The number of instances with <...
3
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2answers
341 views

Why training and validation similar loss curves lead to poor performance

I am training a binary classification neural network model using matlab the graph that I got using 20 neurons in hidden layer is given below. the confusion matrix and graph between cross entropy vs ...
0
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2answers
119 views

How to quantify the performance of the classifier (multi-class SVM) using the test data?

I am working on a traffic sign recognition code in MATLAB using Belgian Traffic Sign Dataset. The dataset consists of training data and test data. I resized the given images and extracted HOG ...
2
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1answer
49 views

i need a characters /letters dataset for matlab

My final project is number plate recognition.i need a data set of A-Z characters and 0-9 letters. i donot find it on any website give me a data set or send me a link. i have to make a neural network ...
1
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1answer
198 views

What is difference between detrend and normalization? [closed]

matlab function detrend subtracts the mean from data. If data contains several data columns, detrend treats each data column separately. One of the normalization technique is subtracting the mean ...
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0answers
63 views

How to visualize SVM classifier output?

After applying SVM non-linear polynomial kernel, how to visualize the output of the classification performance in MATLAB? If anyone knows, please help.
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0answers
63 views

Searching for machine learning algorithm for probability prediction - Matlab

I have a problem, and I'm not sure if there's a suitable algorithm. Let's say I Have a matrix A mX3. The first two columns are coordinates, and the third is the density of flowers in the area in some ...
0
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1answer
218 views

Linear Regression of Sine wave using Gradient descent Not working [closed]

I am writing an algorithm to fit a sine wave. I want to have 4 parameters ( amplitude, frequency, phase & centre position). When I tried to program with all 4 parameters I wasn't able to find a ...
1
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0answers
181 views

How to identify ARIMA model parameters

I am trying to build ARIMA model, I have 144 terms in my standardized time series, which represent residuals form original time series. This residuals, on which I would like to build ARIMA model, are ...
1
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1answer
134 views

Classifying hand written digits dataset using Probabilistic neural network (PNN)?

I am trying to apply Probabilistic Neural Network (PNN) on MNIST dataset using MATLAB on 28000 samples. I tried to build the model but it gave an error saying matrix dimension exceeds memory showing ...
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0answers
30 views

How to create a neural network with many different values in Matlab? [closed]

I want to create a neural network in Matlab. I have 16 import matrices in each iteration, my import data changes in every iteration and there are more than 100000 iterations. The target is a matrix ...
-1
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1answer
167 views

accumarray function not working in matlab

I have an 2D array like the one shown below. 35046, 0.17 1963, 0.34 1135, 0.51 405, 0.68 99, 0.85 1, 0.85 15, 1.02 2, 1.02 ...
2
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1answer
239 views

Can we implement random forest using fitctree in matlab?

There is a function call TreeBagger that can implement random forest. However, if we use this function, we have no control on each individual tree. Can we use the MATLAB function fitctree, which build ...
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0answers
98 views

PCA or FDA on large data set

I want to reduce the dimensionality of my data but I'm having trouble calculating the covariance matrix needed for both principal component analysis and Fisher discriminant analysis. The dimensions of ...
2
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2answers
533 views

How to rank a feature importance?

If I trained a network using Neural Network classifier, how can I know which feature was most important for predicting the target variable? I mean how to create a "feature ranking" among the features (...
-2
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1answer
1k views

Python ,R or matlab for programming very large data set? [closed]

I have a very large panel data set (around 50m observations, size around 3G). Now I want to implement an algorithm on it. The algorithm is basically loops over observations. Ideally I want to use ...
0
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1answer
243 views

Why Matlab neural network classification returns decimal values on prediction dataset?

I have an input dataset (matrix 25x2275) which is normalized to values between 0 and 1. I also have a binary formatted output matrix (3x2275) like 0 0 0 0 0 0 0 0 1, 1 0 0 1 1 1 0 0 1 ... I imported ...
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1answer
2k views

How to calculate Precision and Recall using confusion matrix in Matlab?

I am working on 3 class problem.How to calculate precision,recall ,f-score,MCC of each class while using MATLAB. Here is my confusion matrix: ...
0
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2answers
112 views

How do I compare traditional classifiers performance with my proposed method?

I want to compare my proposed method with traditional machine learning classifiers like Multilayer Perceptron(MLP) and SVM to check the classification accuracy.How do I compare different classifiers?. ...
1
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0answers
247 views

Why is my classification tree is showing only one node, and how to resolve this issue?

I also asked here: https://stats.stackexchange.com/questions/287587/reason-of-getting-only-one-node-while-implementing-classification-tree-in-matlab Hello, I have $N=1520=19*80$ samples, each of ...
2
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1answer
175 views

Does CART algorithm takes into account in the order of the set of attributes?

when using matlab command 'fitctree' for classification purpose, and I change the order of the attributes I do not find the same Tree and thus the same classificaiton error? why? CART algorithm does ...
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1answer
89 views

How to train Matlab on a range of IP addresses?

I'd like to train a Decision Tree using the Classification Learner App. I have a range of IP addresses, and a country that the IP address range belongs to. ...