Stephen23

Active since 2014

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Answered
Extract data from struct array
"Since data(1:10).sys.sys1.sub1.dataPoint1 does not work.." First lets generate your sample structure: dt = 1/1000; T = 5; t...

3 days ago | 0

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How to separate four columns on the basis of 5th column
format short G S = load('Dataset.mat'); D = S.Dataset Method one: ARRAYFUN: V = D(:,5); U = unique(V) C = arrayfun(@(x)D(x...

3 days ago | 0

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Struggling with multiple csv files
"I don't have an idea how to correct these errors. Does anyone have an idea?" The error message already tells you how: "Check t...

4 days ago | 0

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How to create multidimensional array with specified row values
m = 6; n = 7; A = cumsum(ones(m,n),1) A = repmat(1:m,n,1).' A = (1:m).' * ones(1,n) A = min(1:n,(1:m).') A = repmat((1:m)....

4 days ago | 1

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Answered
Compile multiple matrices into one without listing them all out
"how can I do the above final line without typing all numbers up to 60?" The general approach is to use a comma-separated list:...

5 days ago | 1

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using if statement to sort data by flags
"I need some code that will go through each pair of rows (e.g. row 1 and 2 then row 3 and 4 etc.) and check if they both have no...

9 days ago | 0

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How do I fix Invalid use of operator in the Code
T = readtable('LP.xlsx') T.DT = datetime(T.Date, 'ConvertFrom','excel') + days(T.Time)

11 days ago | 0

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Answered
Most efficient way to put vector on the off-diagonal of the blocks of a block matrix
v = [1,2,3,4,5,6,7,8,9,8,7,6]; u = [9,8,7,6,5,4,3,2,1,2,3,4]; L = sqrt(numel(v)); vM = reshape(v,fix(L),[]); uM = reshape(u,...

12 days ago | 1

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Answered
natsortfiles is not working for .png files
This page turns up relatively high on some Google searches, so I might as well make some corrections: "S is a structure. First...

14 days ago | 1

Answered
Deleting elements of an array with consecutively occurring NaN values
A = [NaN,NaN,NaN,NaN,43,NaN,NaN,NaN,45,NaN,NaN,10,22,NaN,NaN,NaN,NaN,36,33,28,21,NaN,20,98,NaN,17,NaN,NaN,NaN,NaN,NaN,2,3,NaN,5,...

16 days ago | 2

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Bringing plots to the "front" to make them more visible?
"s there a way to change the ordering so that it sits on top of the other data series like layers in photoshop?" Of course, use...

19 days ago | 0

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Need guidance: Extracting variable and values from log file
str = fileread('Simulation_Results.txt') tkn = regexp(str,'(\d+):\s*(\d\S+)\s*\n[^\n]+:\s*(\d+)','tokens'); mat = str2double(v...

19 days ago | 0

Answered
Replacing sequences in matrix
A = [4,5,6,7,8,9,10,11,12,13; 104,105,106,107,108,109,110,111,112,113; 204,205,206,207,208,209,210,211,212,213; 304,305,306,307,...

20 days ago | 0

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Answered
the conversion from data string to serial number
Yes, that is the wrong date.... it is also the wrong data type: why are you using deprecated serial date numbers? The DATENUM d...

23 days ago | 0

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Answered
Conversion from d:h:m:s:ms to seconds
"negating the days." I guess you really mean to ignore the days. format long G C = {'104d:11h:59m:38.934815s';'104d:11h:59m:3...

23 days ago | 0

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Answered
How to concatenate cells within cells
"Is there a simple way to do this?" Yes, CELLFUN and VERTCAT: X = {{1},{2},{3},{4}}; Y = {{5},{6},{7;8},{9;10}}; Z = cellfun...

23 days ago | 1

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Answered
Sort elements in cell array in descending order
fun = @(v) sort(v,'descend'); new_cell_array = cellfun(fun, cell_array, 'UniformOutput', false);

24 days ago | 0

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Answered
Question on datestr to datetime conversion
datestr(timeseries(i),formatOut) Most likely TIMESERIES is a serial date number, the use of which is also discouraged and most ...

24 days ago | 0

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Answered
Import data from a bad format
TEXTSCAN is very efficient, and imports numeric data as numeric (i.e. no fiddling around with text): fmt = repmat('%f',1,25); ...

24 days ago | 2

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Answered
Reading uneven datasets from .mat file
Assuming that: the fields are in the required order (otherwise: you can sort them using ORDERFIELDS). the MAT file contains on...

24 days ago | 0

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Using logical array to extract data without reshape
Note that saving those huge lats&lons matrices is rather waste of space: you actually only need the first row/column. "Is there...

24 days ago | 0

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Answered
readtable disfigures the CSV file header
data = readtable('headerFile.csv','ReadVariableNames', true, 'VariableNamingRule','preserve')

24 days ago | 2

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Answered
Something wrong with "floor" or "fix" functions or it's my code?
"Something wrong with "floor" or "fix" functions" Nope, in fact those functions do absolutely nothing in your code. "or it's m...

25 days ago | 1

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Answered
Read CSV into table but not all of the columns
First lets create a fake data file: writetable(array2table(rand(1e5,50),'Variablenames',"V"+(1:50)),"test.csv") Now lets try s...

26 days ago | 0

Answered
Hello. This is my code and I keep getting the error "This statement is incomplete." several times throughout but can't find the mistake.
layers = [ ... sequenceInputLayer(numFeatures) lstmLayer(numHiddenUnits) fullyConnectedLayer(numResponses) regressio...

26 days ago | 0

Answered
Using string() on double values without automatic rounding?
Rather than slow NUM2STR and then STRING, for a scalar the simpler and more efficient approach is to just call SPRINTF: sprintf...

26 days ago | 1

Answered
What is the output after each recursive function call?
"I am confused what is meant by a function call in this case," A function call is every time a function is called. Usually func...

27 days ago | 1

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Answered
Sum of all even index elements of a 1D array
"Why does it output 'No numbers in even positions' when the length of the array is greater than or equal to three and odd?" Bec...

27 days ago | 0

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Answered
How do I separate a matrix that has a nested matrix in a cell before importing it to Classification Learner?
That does not seem like the best use of XLSX: storing lots of numeric data as long strings of text just makes processing the dat...

28 days ago | 0

Answered
How to avoid linear indexing in operations involving matrices of different sizes
RESHAPE is very efficient, because no data gets moved in memory: A = rand(3,3); B = rand(3,2); idx = logical([0,1,1;0,1,1;0,1...

1 month ago | 0

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