Stephen23

Attivo dal 2014

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Risposto
Looping string array into parsed timestamp
"... that is causing issues with the indexing." Because you are mixing up indexing into string arrays with the characters conta...

1 giorno fa | 1

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Risposto
Combining text with non-zero elements of a 2D array
Without an intermediate matrix: N = [10,0,0,0,0;,0,20,0,0,0;,10,0,20,0,0;,0,0,0,10,0;,0,0,0,0,30] C = {'ABC';'DEF';'GHI';'JKL'...

3 giorni fa | 0

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In a table, when I try assigning a value to a new column based on some criteria, I get error that "assignment to elements using simple assignment statement is not supported"
"I don't think I should need a for loop to iterate through each row and replace the value at the "indx" location" You do not ne...

3 giorni fa | 0

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How to replace values in a table with the outputs of another code?
Use curly brace indexing to access the content of the table: https://www.mathworks.com/help/matlab/matlab_prog/access-data-in-a...

7 giorni fa | 0

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Risposto
Matlab function only giving me 1 output
"why is my Vmax just giving me 1 value." Because you used mrdivide / (matrix right division) instead of rdivide ./ (array right...

7 giorni fa | 2

Risposto
Customizing plots that are matrices of column vectors?
X = 1:9; Y = rand(9,2); S = scatter(X,Y); set(S,{'Marker'},{'o';'*'})

10 giorni fa | 1

Risposto
How to use lazy quantifiers in look ahead?
Regular expressions are the wrong tool for this. It might be possible with some effort, but personally I would just use the corr...

11 giorni fa | 0

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Inviato

Interactive Regular Expression Tool
Develop and refine regular expressions in an interactive figure that shows all of REGEXP's outputs.

11 giorni fa | 12 download |

Risposto
Loop through a table using a specific condition and generate new table satisfying the particular condition
ID = ["ID1";"ID1";"ID2";"ID3"]; Value = [5;7;3;1]; T = table(ID,Value) G = groupsummary(T,'ID','sum')

13 giorni fa | 0

Risposto
locate within the first column of a matrix a sequence of numbers and extract those rows
Use DIFF, which is a key MATLAB function. M = load('M.mat').M X = diff([0;find(diff([M(:,1);0])<0)]); Y = size(M,2); C = mat...

20 giorni fa | 0

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Risposto
Rearrange elements of matrix based on an index matrix
Yes, it is awkward. x=randn(5,3) z=randn(5,3) [~,I] = sort(x,2) Perhaps S = size(I); [R,~] = ndgrid(1:S(1),1:S(2)); J = s...

23 giorni fa | 0

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Risposto
Is this a bug of MATLAB?
"I think the correct answer should be longer. Is it a bug or an expected behavior?" It is not a bug: the default number of dig...

25 giorni fa | 1

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Risposto
converting string to num and table
Tip for the future: upload your raw data, not a data extract that you have already imported and modified. S = load('sample1.mat...

28 giorni fa | 1

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Risposto
Faster alternate to all() function
N = 10000; varname = rand(246658,4) idxkeep = randi(size(varname,1),1,N); tic for i=1:N idx = idxkeep(i); idy = ...

28 giorni fa | 1

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Risposto
Finding mean value over certain amount of values in a matrix
Avoid SQUEEZE. More robust: A = [1,2,3;4,6,8;7,12,7;14,4,23] N = 2; C = size(A,2); B = reshape(mean(reshape(A,N,[],C),1),[],...

28 giorni fa | 2

Risposto
subdivide numbers inside a file .xlsx
Simpler: C = readcell('file.xlsx'); M = str2double(split(C(6:end),', ')) T = array2table(M, 'VariableNames',split(C(5),', '))...

30 giorni fa | 0

Risposto
Your variables are reaching 2GB limit,revert to save -v7.3 This will be slower but avoids matlab not saving the data.
"How should I resolve this?" Specify the version when calling SAVE: save(.. , '-v7.3')

circa un mese fa | 0

Risposto
How to open and modify .dat file
unzip nema.zip fid = fopen('nema.dat','rb'); arr = fread(fid,'int8'); fclose(fid); dim = [364,364,110]; arr = reshape(arr,d...

circa un mese fa | 0

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Risposto
unique across tables within table
U = unique(vertcat(RawFileIndex.Parameters{:}).ID)

circa un mese fa | 0

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Risposto
Finding multiple Matrix in a txt file
"For example (in my own dumb coding brain) I would like matlab to "Search a txt file that has a certain name that the user can s...

circa un mese fa | 1

Risposto
how to make the numbers on the matrix with alternative sign?
n = 5; m = toeplitz([2,1,zeros(1,2*n-2)]) .* -(-1).^gallery('minij',2*n)

circa un mese fa | 0

Risposto
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...

circa un mese fa | 0

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

circa un mese fa | 0

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Risposto
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...

circa un mese fa | 0

Risposto
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)-'...

circa un mese fa | 1

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

circa un mese fa | 0

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Risposto
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

circa 2 mesi fa | 1

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Risposto
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.',...

circa 2 mesi fa | 0

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Risposto
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...

circa 2 mesi fa | 0

Risposto
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: ...

circa 2 mesi fa | 1

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