stelios loizidis
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Accept 20 answers given by other contributors
Awarded to stelios loizidis on 25 Mar 2022
Feeds
Question
GARCH model for day-Ahead stock price forecasting
Hello. I want to forecast stock market prices one day ahead (i.e 48 prices ahead). In the TrainDatax matrix (50X72) I have the ...
1 year ago | 1 answer | 0
1
answerQuestion
How to make a surface plot for two vectors?
Hello, I have two row-vectors, A (1X8000) and B (1X8000). What I want is their surface plot. I tried the commands below: surf(...
1 year ago | 1 answer | 0
1
answerQuestion
Scale/Normalize values in matrix between 10^-6 and 10^-5
Hello, I have a matrix Data (90X150) and I want its values to be normalized. I wrote the code below: % Normalization min_Data...
1 year ago | 1 answer | 0
1
answerQuestion
Finding position of values which are equal to some value
Hello, I am trying to find the position of values in the ND matrix (1X1800) which are equal to the val matrix (1X6) according t...
1 year ago | 1 answer | 0
1
answerQuestion
Select values based on datetime
Hello, I have the matrix Values (1X2100) and the corresponding DateTime matrix with datetime data (1x2100 datetime). The values...
1 year ago | 2 answers | 0
2
answersQuestion
Creating a matrix based on sorted values from another matrix
Hello, I have matrix A, 1X5, and matrix B, 1X5 % Matrix A A=[0.0012,0.0011,0.0011,0.0014,0.0015]; % Matrix B B=[40.5,66,12,...
2 years ago | 1 answer | 0
1
answerQuestion
Repeat resampling with replacement process several times
Hello, I have the below code for resampling with replacement. res1 = []; res2 = []; % centerd matrix size:2X7 cen1=cent...
2 years ago | 1 answer | 0
1
answerQuestion
Finding specific values from a matrix
Hello, I have the matrix Values (1X3000), upper limit (=100) and lower limit(=30). What I want is for the Specific_Values matri...
2 years ago | 1 answer | 0
1
answerQuestion
Box plot into figure with another graphs
Hello, I have a matrix with predictions (100X24). I sorted this matrix and made a plot of the confidence intervals (maximun and...
2 years ago | 1 answer | 0
1
answerQuestion
Storing matrices in cells
Hello, I have the following code: for i=1:20 %psudoinverse pH_matrix=pinv(H_matrix); % H_matrix: 1X20 B=pH_matrix*Y(i,:);...
2 years ago | 1 answer | 0
1
answerQuestion
I want vector surface plot
Hello, I have three vectors: Prices:1X30, Position:1X30 and Quantity:1X30 and I want to do the surface plot. I get the followin...
2 years ago | 2 answers | 0
2
answersQuestion
Labels above bar-plot
Hello, I have a matrix A (1X40). For this matrix I make its bar-plot. Aslo, I have the matrix B (1X40) which contains values, w...
2 years ago | 3 answers | 0
3
answersQuestion
Assign dates with number
Hello, I have the following code % read from excel file [~,~,Data]=xlsread("Fuels_2019_2020.xlsx","Fuels_2019_2020") Fuels_D...
2 years ago | 1 answer | 0
1
answerQuestion
How can the points of a scatter plot placed on a new matrix?
Hello, I have the following. I have a matrix W (2Χ50) and I make the scatter plot for each of its row, that is, scatter(W(1,:)...
3 years ago | 1 answer | 0
1
answerQuestion
Create a plot with values from matrices of many dimensions.
Hello, I have the following matrices: A:10X10X10X10, B:10X10X10X10, C:10X10X10X10, D:10X10X10X10 and S:10X10 What I want is a...
3 years ago | 1 answer | 0
1
answerQuestion
Initial values on the plot
Hello. I have a matrix X (2X40). In the values of this matrix I apply normalization and matrix Xnorm appear (2X40). Next, I make...
3 years ago | 1 answer | 0
1
answerQuestion
contour3-With 3 dimensions input arguments
Hello. I have the following: Α:24X24X24, B:24X24X24 and C:24X24X24 I want to make the contour3 plot contour3(A,B,C) but it s...
3 years ago | 2 answers | 0
2
answersQuestion
Create a triangular matrix
Hello, I have the following issue. I have a matrix A with dimensions 3x500 and I want to calculate the matrix B which is triang...
3 years ago | 1 answer | 0
1
answerQuestion
Find similar values from different tables
Hello. I have two matrices, the A1 (270X1) and the A2 (171X1). Matrix A2 has some values, which are the same as some of matrix ...
3 years ago | 1 answer | 0
1
answerQuestion
Replace number with text
Hello, I have the following problem. I have a matrix A which has dimensions of 300x350. In this matrix I want to replace the val...
3 years ago | 2 answers | 0
2
answersQuestion
Replace values in a matrix
Hello. I have the following problem. I have a matrix A with dimensions 1X72. I want in matrix B to have the mean per 24 values....
3 years ago | 1 answer | 0
1
answerHow do I find the number of hours?
Another question I have is if I have table A but the available data are as follows: 1/2/2014 01:00, 4/5/2014 05:00, 6/8/2014 16:...
3 years ago | 0
Question
How do I find the number of hours?
Hello, I have a matrix A with dimensions 35000X1 (datetime). There are hours in matrix A. For example, 01:00, 05:00, 17:00, 23...
3 years ago | 3 answers | 0
3
answersQuestion
MAE and RMSE in percentage
Hello, I have the following question: I want to calculate the MAE and RMSE in percentage. The following code gives the correct ...
3 years ago | 1 answer | 0
1
answerQuestion
How do I find the corresponding dates for maximum prices?
Hello. I have a matrix A with dimensions 366x24 which contains values and a matrix B which contains dates-time (366x24 datetime)...
3 years ago | 1 answer | 0
1
answerQuestion
How do I read (hours) data from the .xlsx file?
Hello, I have the following issue. In a .xlsx file I have in column D hours (format: 00: 00: 00,01: 00: 00, ... 23:00:00). How ...
4 years ago | 2 answers | 0
2
answersQuestion
Separate datasets into months
Hello,I have the Data matrix (1X1744) which contains values for two years (2014-2015) and Time (1X1744) is datetime contains the...
4 years ago | 1 answer | 0
1
answerQuestion
Multiplication between matrices with different dimensions
Hello. I have the following issue: I have the matrix H which has a size of 353X25. Next I calculate the pseudo-inverse H_inv (25...
4 years ago | 1 answer | 0
1
answerQuestion
Save values from iterations
for r=1:5 for w=1:100 Datax(r,:)=(W'*NewDatax(r,:)')'; % size: NewDatax 5X70 ntempDatax=Datax+b; Values(r,:)=ntempData...
4 years ago | 1 answer | 0
1
answerQuestion
Add elements to a matrix
Hello. I have the following problem: I have a matrix A (3x3), and I want to add elements to this matrix and create table B wit...
4 years ago | 1 answer | 0
1
answer
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