# Stephen23

Actif depuis 2014

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Adding column in cell array before converting to a matrix.
Here are a couple of approaches. First lets create some fake data: C = {randi(9,3,2),randi(9,2,2),randi(9,4,2)} C{:} Method o...

2 jours il y a | 0

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"readtable struggling to interpret spreadsheet as numbers" Unfortunately due to that broken CSV format we need to import everyt...

2 jours il y a | 0

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How to convert datetime into a number?
txt = '08-Jan-2016 05:40:00' dtn = datetime(txt,'InputFormat','d-MMM-y H:m:s', 'Format','yyyyMMddHHmmss') https://www.mathwork...

3 jours il y a | 0

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Creation of binary coded image from a matrix
A = [0,2;1,3;7,14] Method one: BLOCKPROC (requires image toolbox, probably not very fast): F = @(s)reshape(dec2bin(s.data,4)-'...

3 jours il y a | 1

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How to convert numbers to text
v = fix((0:14)./5).' w = char(v+'x')

4 jours il y a | 0

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How to search for table column via a string
y = rawTable.(string); % ^ ^ https://www.mathworks.com/help/matlab/matlab_prog/access-data-in-a-table.html

4 jours il y a | 1

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How to use indices of one matrix as entries of another matrix?
Fake data: M1 = reshape(randperm(256)-1,16,16); Y = find(M1==hex2dec('34')); M1([1,Y]) = M1([Y,1]) Convert: C = 1+mod(M1.',...

8 jours il y a | 0

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Save in an array lines after the appearance of a text pattern
txt = fileread('File.txt') rgx = 'Cell\s*\(Angstrom\):(\s+\S+){9}'; tkn = regexp(txt,rgx,'once','tokens'); mat = sscanf(tkn{1...

9 jours il y a | 0

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Reading unformat text file with strings and numbers
In lieu of a sample data file provided by the OP I created my own... Lets try importing it using READTABLE and a few options: ...

10 jours il y a | 1

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How can I iterate through an array using a for loop?
Given an array of paths: C = {'C:\Users\me\Documents\My Info','C:\Users\me\Documents\My data'}; F = @(p)dir(fullfile(p,'*.xlsx...

10 jours il y a | 0

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Store a script as a function
If you want to call RANDOMSTART from e.g. another function or from the command line then it must be a function. What you have is...

10 jours il y a | 0

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Collect information of a file with the same kind of text pattern
txt = fileread('file.txt'); rgx = 'Cr(\d+)\s*Cr(\d+)\s*\(\s*(\S+),\s*(\S+),\s*(\S+)\).+@.*\n.+\n.+\n[^:]*:\s*\(\s*(\S+)\s+(\S+)...

10 jours il y a | 2

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I am getting "Conversion to logical from table is not possible." error, how do you solve it?
"How can I solve this problem?" Use the correct indexing: c0 = Table(ind_coeff,2); % what you are doing: return another table ...

11 jours il y a | 0

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Importing files in bulk chnages table columns to NaNs
Avoid the inner loop: T = load('T.mat').T if width(T)>=37 V = str2double(string(T{:,37})); V(isnan(V)) = 0; T =...

18 jours il y a | 0

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order using first column in array cell
The basic problem is that you are storing scalar strings in a cell array. This should be avoided: "If you create variables that ...

19 jours il y a | 0

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Extract two floating point numbers from a string
T = '23.047°S 67.782°W 9.876°N 5.432°E' ; V = sscanf(regexprep(T,{'(\S+)°[SW]','(\S+)°[NE]'},{'-\$1','+\$1'}),'%f')

21 jours il y a | 1

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Parse csv with complex numbers written by Python numpy
Forget about fiddling about with strings. Define the parentheses as delimiters and import as numeric: format short G M = readm...

23 jours il y a | 0

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Taking outer product of two matrices
"However, the ⊗ operator between ∇ and u isn't the simple multiplication operator *." The Wikipedia page you linked to states "...

25 jours il y a | 0

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Not enough input arguments
"I am a little perplexed by this warning from matlab: "Not enough input arguments" for my following code" Lets take a look at h...

29 jours il y a | 0

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why does it change the number when using VPA?
"why does it change the number when using VPA?" It doesn't. That "loss of digits" is completely unrelated to VPA. The change o...

29 jours il y a | 2

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How can I use the data of a set of matrices labelled in order
"Thank you also for pointing about about dynamic variables, but as a beginner I am lacking options." You decided to use LOAD, s...

29 jours il y a | 0

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i have a csv with data separated with commas and columns also are separated with commas
T = fileread('piloto.csv') T = regexprep(T,',(\d+e)','\.\$1') % you could also save this to a proper CSV file C = textscan(T,''...

30 jours il y a | 0

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extract multiple slices of difference sizes from a vector
The MATLAB approach: A = [1 4 6 5 4 8 7 8 6 4]; N = [2 3 5]; C = mat2cell(A,1,N); Checking: C{:}

30 jours il y a | 0

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How to read lines from cell
S = readlines('T04102.txt'); X = find(startsWith(S,'PID 01')); F = @(x) regexp(S(x:x+3),'[01]{4}\s+[01]{4}','once','match'); ...

environ un mois il y a | 0

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Why is str2num not recommended when it is faster in certain circumstances?
"Why is str2num not recommended when it is faster in certain circumstances?" Because it relies on EVAL. Code called by EVAL is ...

environ un mois il y a | 0

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Function input argument block - defining multiple valid classes for input data.
"I'd like to consolidate these two functions into one function so I do not have the need for multiple files." You do not need m...

environ un mois il y a | 1

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How to read an excel /csv files with columns that have both text and numbers?
fnm = 'sample.csv'; tmp = readcell(fnm, 'Delimiter',','); idx = cellfun(@ischar,tmp(:,1)); assert(all(diff(idx)<1)) nhl = nn...

environ un mois il y a | 0

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Vectorization for Two Nested for-loops
Without creating multiple copies of data in memory: A = [2 3 4; 5 2 1; 1 4 3]; B = [3 4 4; 4 2 1; 4 4 1]; C = sum(permute(A,[...

environ un mois il y a | 0

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How can.struct data be made available to non-MATLAB users?
"Can a .struct with nested structs, using a multitude of fieldnames and datalines, be converted to a non-MATLAB format like exce...

environ un mois il y a | 1

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Accessing cell array entries using arrays
B = [1,2,2,1,1; 2,1,2,1,2]; V = 1:size(B,2); A = accumarray(B.',V(:),[],@(m){m.'}) A{1,2}

environ un mois il y a | 0

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