Answered
How to merge new variables and append new rows at the same time (when synchronizing timetables)?
R1 = array2timetable(randi([36 40],5,2),'RowTimes',dateshift(datetime('today'),'dayofweek','Friday',-5:-1),'VariableNames',["x1"...

3 years ago | 0

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Answered
Undefined function 'extractfield' for input arguments of type 'struct' in MATLAB R2023a
"After upgrading from Version 2022b to 2023a today morning, it gives me an error in the exact same code which was running perfec...

3 years ago | 0

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Answered
Extracting datetime and adding reference time
fnm = 'GPS_P01.txt'; txt = fileread(fnm); one = regexp(txt,'(?<=REFERENCE\s*TIME\s*:\s*)[^\n]+','ignorecase','match','once'); ...

3 years ago | 0

Answered
finding a numeric pattern in an array
V = [11,5,3,4,5,1,2,3,4,5,1,2,3,4,5,1,2,3,4,5,1,2,3,4,5,1,2,3,4,5,1,2,11,2,31,5,1,2,11,2,31,5,1,2,11,2,31,5,1,2,11,2,31,5,1,2,11...

3 years ago | 0

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Answered
COMBINE MULTIPLE ASCII FILE WITH SIMILAR COLUMN FORMAT OF (X,Y,Z) INTO SINGLE SINGLE FILE OF SAME COLUMN (X,Y,Z)
[F,P] = uigetfile('*.asc','Select the asc-files', 'MultiSelect','on'); F = cellstr(F); C = cell(size(F)); for k = 1:numel(F) ...

3 years ago | 0

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Answered
Select values of a matrix given a matrix of indices?
"is there any fast way to do this?" Use SUB2IND: A = rand(10,10) x = [2,3;5,7]; y = [4,6;1,2]; idx = sub2ind(size(A),x,y); ...

3 years ago | 1

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Answered
How to combine two tables using sorted common variable?
You could use OUTERJOIN: https://www.mathworks.com/help/matlab/ref/table.outerjoin.html a = load('data_A.mat'); a = a.data_A ...

3 years ago | 1

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Answered
Matlab column extraction sematics
" Is there some guide to datatypes and operations on them in Matlab that would cover this?" Of course: https://www.mathworks.co...

3 years ago | 0

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Answered
how to transform a table with column names into an double array without column names
"But using 'table2arrray' directly, entries of 'X' are all transformed into '0'." I doubt that. What is much more likely is tha...

3 years ago | 0

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Reading a single numerical value from regexp return
Get rid of the loop and process the entire file at once. Line-by-line just makes it more complex. You can get rid of one layer ...

3 years ago | 1

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Answered
Finding the indexes of multiple substrings within a larger string.
idx = regexp(c,'\d\d') % no overlaps idx = regexp(c,'\d(?=\d)') % with overlaps

3 years ago | 1

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Answered
I don't understand what this function is doing 'Invoke'
"but what these 0, 0, 0, 0, 1, 1, 0 is doing? also that 2 at the end?" Those are inputs to some COM object's method. The method...

3 years ago | 0

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Why can't the index variable of a for loop be stored in a structure or other array?
"More broadly, is there some way to store index variables together?" status.loop1 = 1:10; for k = status.loop1 %do someth...

3 years ago | 1

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Choosing specific column within cells
Why not just use the same loop? There does not seem to be any point in using a second loop. for k = 1:numel(C) F = fullfil...

3 years ago | 0

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Answered
Creating new matrices with input depending on csv filename
See: https://www.mathworks.com/help/matlab/ref/fullfile.html https://www.mathworks.com/help/matlab/import_export/process-a-sequ...

3 years ago | 0

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Answered
How to select specific rows of data from .mat file containing multiple column vectors
F = 'name of your mat file'; S = load(F); D = structfun(@(v)v(100:499),S, 'uni',0)

3 years ago | 0

Answered
count nan of different rows
S = load('TG_sshobscorr.mat'); D = S.sshobscorr; Try either of these: N = sum(~isnan(D),2) N = sum(isfinite(D),2)

3 years ago | 0

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Answered
How to fix error with while loop?
"I keep getting the error shown below. How can I fix this? " By doing exactly what the error message tells you: move the script...

3 years ago | 0

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when I using readtable to read .csv file all variable data get mixed, what are the reason for this and provide proper solution for this
There is no need to change the file format when you can simply specify the delimiter when importing: T = readtable('daily_cloud...

3 years ago | 0

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Answered
Adding Matrices into main diagonal of Matrix
"As we can see, matrix is not a 10x10 matrix with the main diagonal filled with the intended values above." After calling BLKDI...

3 years ago | 0

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Answered
How do I add to a structure in a for loop?
Rather than creating another variable, simply store the imported data in the same structure that you are already using. I also i...

3 years ago | 0

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Answered
Preallocating and filling long array with shorter arrays
The simple apparoach is to use a matrix or array, for example: N = 10; M = nan(5,N); for k = 1:N M(:,k) = rand(5,1); en...

3 years ago | 0

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Answered
posix/unix time to datetime
Unix time is actually defined as the number of seconds since the epoch. The times you show are the milliseconds since the epoch....

3 years ago | 1

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Answered
don't know how to write my for loop
The loop might be clearer iterating from 2, for example: N = 121; % total number of vectors A = rand(21,21); M = nan(21,N); ...

3 years ago | 0

Answered
I'd like to skip the file that's not there and bring it up!
A simple alternative approach is to use DIR: S = dir('01__input/NO_*.mat');: for k = 1:numel(S) F = fullfile(S(k).folder...

3 years ago | 0

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convert char to table or cell
T = readtable('data.txt', 'Delimiter','|', 'VariableNamingRule','preserve')

3 years ago | 0

Answered
count the number a letter appears in a string and plot a histogram
V = categorical(["A","C","G","T"]); W = V(randi(4,1,23)) histogram(W)

3 years ago | 0

Answered
Intermediate dot indexing produced a comma-separated list with 34 values, but it must produce a single value when followed by subsequent indexing operations
The documentation https://www.mathworks.com/help/bioinfo/ref/getpdb.html#bq5gvma-2 states the the MODEL field can be a structu...

3 years ago | 0

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Answered
How to sort the rows of an array by the total number of zeros in the row
A = [1,0,0;2,0,0;3,0,0;0,1,0;1,1,0;2,1,0;0,2,0;1,2,0;0,3,0;0,0,1;1,0,1;2,0,1;0,1,1;1,1,1;0,2,1;0,0,2;1,0,2;0,1,2;0,0,3] [~,X] =...

3 years ago | 0

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Answered
Resample function is not working properly and damaging the signal
It is easy to avoid the loop too, it is just a simple linear interpolation: p = 3; q = 2; tx = (0:p:300-p).'; x = cos(2*pi*t...

3 years ago | 1