Community Profile # Joana

Last seen: 2 months ago Active since 2018

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Question

Concatenate 3-D matrix in a for loop
Hi I have 25 matrices of 3-D 150x66x1000. I need to concatenate them in a for loop to get an output of 3750x66x1000. How can...

3 months ago | 3 answers | 0

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Question

Default learning rate and initial weights for trainscg neural network
Hi I am trying to train a neural network with trainscg function. and i want to know the default parameters for following: 1:...

5 months ago | 1 answer | 0

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Question

How to select 10% of a matrix with an increment of 10% until 80%
Hi I have a matrix x with size 200x353. I need to sleect 10% of the matrix with an incerement of 10% until 80%, so something li...

5 months ago | 1 answer | 0

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Question

Leave one out of an array in a for loop
Dear all I have a program where i need to save one variable separately and concatenate i-1 elements in another variable (Then...

5 months ago | 0 answers | 0

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Question

Select sample from an array
Hello I have an array of 200x259 samples. I need to make a new array of all the rows but for column i have to reject 3 samples ...

6 months ago | 1 answer | 0

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Question

How to calculate peak voltages of a waveform.?
I have an EEG potential waveform, which has multiple peaks (Positive and negative). I'm using the findpeaks function to find the...

1 year ago | 1 answer | 0

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Question

How to take Mean of cell array ?
Hi I have a struct variable A with 1x15 cell, where each cell array is of variable size in it's 1st dimension and other two dim...

1 year ago | 1 answer | 0

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Question

How to save data at each iteration in a cell array?
Hi, I have saved data sests where i have two variables of 3-D, A and B. I want to load it for each subject and save it in a cel...

1 year ago | 1 answer | 0

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Question

Error using table.init (line 401) The VariableNames property must contain one name for each variable in the table.
Hi I am trying to save the variables in the form of .xls table but it gives the following error: Error using table.init (line ...

1 year ago | 1 answer | 0

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Question

How can I test a trained Neural Network Model on new test data?
Hi, I am trying to test a trined NN model in MATLAB but it's giving the wrong output. I have trained the model on input of or...

1 year ago | 0 answers | 0

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Question

How to process files of a particular order in MATLAB?
Hi I have saved data for multiple subject's, multiple sessions with the following name format: Sub1_S1_Epochs,Sub1_S2_Epochs,...

1 year ago | 1 answer | 0

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Question

How to test neural network trained model?
Hi I am using NN for classification purpose, i know how to do this for one subject, by didviding the data in training:testing...

1 year ago | 1 answer | 0

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Question

Dot indexing is not supported for variable of this type.
Hi all, I want to use EEGLAb function to remove the epochs with a value greater than +-150uV in the time interval of 0-0.8ms. I...

1 year ago | 2 answers | 0

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Question

Save variables in a folder
Hi, I have written a code to extract 'epochs' from 'data'. I need to save 'ErrPsEpochs' and 'NonErrPsEpochs' for each subject a...

1 year ago | 1 answer | 0

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Question

Calculate mean of an array in time windows.
Hi i have EEG data recorded at 1200hz from 5 channels, for 10 repetitions, and i need to calculate mean of each 1s signal in 10...

1 year ago | 1 answer | 0

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Question

Spectrogram of EEG Signal
Hello I have EEG signals which i need to classify, for that i need to change the EEG signals to the Images, i.e by taking spect...

1 year ago | 0 answers | 0

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Question

Maximum number of input neurons to the neural network
Hi, I have EEG data to classify, for 2 classes. The data dimesnion is 30000x512. Where 512 is the number of samples (50:50 for ...

1 year ago | 1 answer | 0

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Question

How to save a neural network to test on a new dataset?
Hi, I am using the following code to train and test NN for 2-class classification. I need to save the trained network to test o...

1 year ago | 1 answer | 0

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Question

How to prepare the Input for feedforward neural network?
Hi All, I have to use feedforward neural network for 2-class classification problem. I have EEG data (of 1s, recorded at the sa...

1 year ago | 1 answer | 0

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Question

Repeat 3-D array elements
Hi I have a 3-d array x of size 67x960x80. I need to repeat the elements of the array 3 times to make it an array of size 67x96...

1 year ago | 1 answer | 0

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Question

Index must be a positive integer less than or equal to the number of test sets.
Hi i'm trying to create 10-fold cross validation for my CNN. To create the 10 batches I'm using a for loop, but it's giving thi...

1 year ago | 1 answer | 0

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Question

'Index must be a positive integer less than or equal to the number of test sets.'
Hi i'm trying to create 10-fold cross validation for my CNN. To creat the 10 batches i'm using for loop, but it's giving this e...

1 year ago | 0 answers | 0

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Question

Divide the matrix randomly, based on columns
Hi I have a matrix x of size 78000x204. I need to divide it into nonoverlapping but random 70:15:15 percent of the data, based ...

1 year ago | 1 answer | 0

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Question

Shuffle the rows a matrix
Hi I have a matrix x of size 512x3600, and another matrix y=512x1, I need to shuffle the entire rows of matrix x and alement of...

1 year ago | 1 answer | 0

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Question

String to Categorical array
Hi I have an array of x=[zeros(1,120) ones(1,240)]; I want to convert it into a categorical array of 'Z' of size 1x120 and 'O...

1 year ago | 1 answer | 0

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Question

COnvert 3d matrix to 2D
I have a matrix of x=1200x30x410, i need to change it to 2D as x=3600x410. How to do that.? it gives an error by using reshape ...

1 year ago | 1 answer | 0

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Question

CNN for EEG 2-class pattern classification
Hi I am new to using the deep learning for classifcation so i have some basic questions, i will highly appreciate if anyone ca...

1 year ago | 1 answer | 0

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Boxplot for multiple categorical data sets
Hi Cris, Thanks a lot for the reply. Second function works okay for me but i have a few more pointers, i'll highly appreciat...

2 years ago | 0

Question

Boxplot for multiple categorical data sets
Hi I want to plot the Boxplots for 3 repeated variables collected for 4 data sets, where each data set has 15x3 values. So i ...

2 years ago | 3 answers | 0