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# Stephen23

Active since 2014

Suspensa Vix Via Fit

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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

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

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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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

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

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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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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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

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

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

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

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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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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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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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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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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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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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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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

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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24 days ago | 2

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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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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

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

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

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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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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