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Accept 20 answers given by other contributors
Awarded to pavlos on 20 Jul 2017
Feeds
Question
Finding the sum of every nth row ( n is not fixed)
Hello, Consider a nx2 matrix M with M= [ 0 4 1 10 1 11 1 20 2 4 2 9 2 8 2 7 . 23 8 23 6 0 8 0 7 1 2 2 5 . . ...
5 years ago | 1 answer | 0
1
answerQuestion
Finding the average of every nth row but n is not fixed.
Hello, Consider a nx2 matrix M with M= [ 1 10 1 11 1 20 2 4 2 9 2 8 2 7 . . . ]; How to find the average of the ...
5 years ago | 1 answer | 0
1
answerQuestion
Create new matrix through rolling window
Hello, Please help me with the following: Consider a matrix A 365x24. I need to create different matrices that are formed i...
5 years ago | 0 answers | 0
0
answersQuestion
Rolling window column selection
Hello, Please help me with the following: Consider a 365x1 matrix A. I need to extract the new column vector as: v1:...
6 years ago | 2 answers | 0
2
answersQuestion
Store every n rows of a matrix in cell
Hello, Please help me with the following: Consider a 11808x1 matrix A. I need to take every 96 elements and store them ...
6 years ago | 1 answer | 0
1
answerQuestion
Compute distances between an element and all other elements of a matrix
Hello, Please help me with the following: I have a matrix M 150x4. Ι need to calculate the distances (separately, the E...
6 years ago | 1 answer | 0
1
answerQuestion
Combine a number of .mlapp files into a single .mlapp file
Hello, Please help me with the following. I have a number of .mlapp files created by App Designer, for example File1.ml...
6 years ago | 1 answer | 0
1
answerQuestion
Store matices in .xls files
Hello, Please help me with the following: After an execution of an algorithm, 3 matrices are created and stored in a cel...
7 years ago | 1 answer | 0
1
answerQuestion
Read files from a different directory in standalone applications
Hello, Please help me with the following: I create a standalone executable with Application Compiler App (I am using R2017...
7 years ago | 2 answers | 0
2
answersQuestion
Generate random negative and positive values with specific average
Hello, Please help me with the following: I would like to create an array (e.g. 1 x 10) with random numbers both negative ...
7 years ago | 2 answers | 1
2
answersQuestion
Compare two arrays based on indexes
Hello, Please help me with the following: consider two arrays A=[19;20;19;20;21;22]; B=[1;1;4;4;4;4]; A user s...
7 years ago | 1 answer | 0
1
answerQuestion
count the number of hours in a day (multiple values per hour)
Hello, Please help me with the following. Consider a matrix M= [ 0 0 1 2 2 2 2 3 3 ... 23 0 1 1 2 2 ...
7 years ago | 1 answer | 1
1
answerQuestion
Sum of elements per hour
Hello, Please help me with the following: consider a matrix M= [ 1-Oct-13 0 2 1-Oct-13 0 6 1-Oct-13 1 2 ...
7 years ago | 2 answers | 0
2
answersQuestion
ANFIS: Out-of-sample forecasting
Hello, Please help me with the following: Consider a TrainInput matrix A= [6445.63 6341.97 6554.53 6445.63 66...
8 years ago | 0 answers | 0
0
answersQuestion
Read mat files from a custom function
Hello, Please help me with the following: I need to create a function (m.file) that reads automatically mat files with dif...
8 years ago | 1 answer | 0
1
answerQuestion
exclude the maximum value per column
Hello, Consider a matrix 365 x 24. How can I exclude the maximum value per column? The final matrix will be 365 x 23 an...
8 years ago | 1 answer | 0
1
answerQuestion
Reduce the number of zeros in an array
Hello, Please help me with the following: I study some data that contain arrays with many repeated zeros. I need to re...
8 years ago | 2 answers | 0
2
answersQuestion
how to replace a sequence of specific length of NaNs?
Hello, Please help me with the following: Consider vector A=[2.15,NaN,NaN,1.14,NaN,NaN,0.59,NaN,NaN,0.14,NaN,NaN,0,Na...
8 years ago | 1 answer | 0
1
answerQuestion
vector missing values filling
Hello, Please help me with the following: Consider a vector Α where its columns refer to hourly values of a variable. V...
8 years ago | 1 answer | 0
1
answerQuestion
Seconds counter within a day?
Hello, Please help me with the following: I need to count the seconds from one period to another within a day. For exam...
9 years ago | 1 answer | 0
1
answerQuestion
PCA dimension reduction problem
Hello, I have a matrix M 200x80000 and I want to transform it to 200xLower_Dimension. Using the command [coeff,score,laten...
9 years ago | 1 answer | 0
1
answerQuestion
Combine values of many elements into a single element
Hello, Consider a matrix A 100x7: 1 NaN 2 0 1 6 5 1 NaN 2 0 1 1 4 .... How can I form a new matrix 100x1 that tak...
9 years ago | 1 answer | 0
1
answerQuestion
Incomplete time series: Fill missing dates with NaNs
Hello, I need to fill the missing dates with NaNs. The format of the data is as follows: month-day-year-hour-minute-se...
9 years ago | 1 answer | 0
1
answerQuestion
How to remove elements in a vector using length function?
Hello, Consider a vector with length equals 110. I want to remove the elements that are correspond to the indices that are...
9 years ago | 1 answer | 0
1
answerQuestion
merge arrays into a new one with a specific element sequence
Hello, Please help me with the following: Consider two arrays, A=[a1;a2;a3] and B=[b1;b2;b3]. How can I get a new array...
9 years ago | 1 answer | 1
1
answerQuestion
Form a new matrix based on a distance comparison
Hello, Please help me the following: Consider a threshold value, "thres=0.5" an a 100x10 matrix A=rand(100,10); Take...
10 years ago | 1 answer | 0
1
answerQuestion
hierarchical agglomerative clustering: distance matrix
Hello, Please help me with the following: In hierarcical clustering, initially every patern is considered a cluster (singl...
10 years ago | 0 answers | 0
0
answersQuestion
xlswrite: write values in different columns
Hello, Please help me with the following: Consider a column vector, say "x", with dimension 1000x1. The values of x ar...
10 years ago | 2 answers | 0
2
answersQuestion
Econometrics Toolbox: estimate the probability of different time series predicitions
Hello, Please help me with the following: Consider a time series of length N=100 (100 observations). An ARIMA model is ...
10 years ago | 1 answer | 0
1
answerQuestion
curve fitting without the toolbox
Hello, I would like to ask if there are any functions that can I use to fit two series of data without using the Curve Fitt...
10 years ago | 2 answers | 1
2
answers
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