Stephen23

Active since 2014

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Error in formatting csv files imported from python
Well, those are some very badly designed files: if they had stored the data as a standard CSV file with one column for each vari...

16 hours ago | 0

Answered
How to merge two tables into a single table?
Assuming that the tables already exist: table1 = table(["Smith";"Nguyen";"Williams";"Fernandez";"Brown"],[38;43;38;40;49], ... ...

2 days ago | 0

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Answered
saving struct empty give me error
"hi, it's possibile to save empty struct? How can i do it?" Of course, just give the variable name exactly like you would any o...

7 days ago | 0

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Answered
trying to extract the months to create a format looks like 202404, how to do that ?
s = ""; % your string array dt = datetime('now') dt.Format = 'MMM yy'; % the format given in your example code s(1) = dt dt....

7 days ago | 0

Answered
How can I insert a variable into a plot legend, with a special character following the variable?
Using STRING: plot(rand(5,4)) m = pi; legend('','','',"Gradient: "+m+"\circ/mm") Using CHAR: plot(rand(5,4)) m = pi; t = ...

9 days ago | 0

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Answered
Lineanchor not working in regexp
My guess is that you have not taken the newline characters into account. Note the difference: tx1 = sprintf('Hello\r\nWorld'); ...

9 days ago | 0

Answered
How do I convert a decimal number of months to a datetime format?
"The only way I can think of is manually converting by identifying the length of the month the offset represents." Let MATLAB d...

10 days ago | 1

Answered
How can I keep the first two elements from CSV values in a string
S = ["";"philosopher,historian,writer,political activist,literary critic";"philosopher";"philosopher,writer"] T = regexp(S,'^[^...

14 days ago | 0

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Answered
How to compute mean value of a field in a struct?
Rather than nesting lots of separate structures in a cell array, why not just use one structure array?: C = load('featuresnew.m...

15 days ago | 0

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Answered
splitting a vector into separate vectors
A much better approach using a cell array: V = [2,2,2,2,2,4,4,4,7,7,8,9] L = diff(find([1,diff(V),1])) C = mat2cell(V,1,L)

16 days ago | 0

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Answered
Concatenating Mixed numbers looses the decimal places
"How can I retain the decimal numbers " A = [n,double([MaxI,MinI]),medianMaxIntensity, Hlg,Bren,fwhm2D]; % ^^^^^^^^ ...

21 days ago | 0

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Answered
How do I do char2num (assume Ascii)?
https://www.mathworks.com/help/matlab/matlab_prog/unicode-and-ascii-values.html txt = char(120:122) num = double(txt) If you ...

22 days ago | 0

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Answered
writematrix: how to get formatted txt-output?
M = [100,0,4500;0,1,38.29;1,1,38.22] S = join(compose("%10.2f",M),''); writelines(S,"test.txt") Checking: type test.txt

22 days ago | 0

Submitted

Convert between RGB and Color Names
RGB to color name. Color name to RGB. Supports many palettes: CSS, dvips, HTML, MATLAB, RAL, SVG, X11, xcolor, xkcd,...

22 days ago | 25 downloads |

Answered
Random number vector with only two values
Indexing is a basic MATLAB superpower. You can easily use indexing to select from a vector of any values: V = [0,pi]; W = V(ra...

23 days ago | 1

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Answered
Character string to numeric vector
txt = ' ( 0.0357 -0.0001 0.0051) ' vec = sscanf(txt(3:end),'%f',[1,3]) or vec = sscanf(strtrim(txt),'(%f%f%f',[1,3])

26 days ago | 0

Answered
how to delete the files in a folder using matlab?
delete(fullfile(inpath,baseGran,'sigma*.img'))

26 days ago | 1

Answered
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...

28 days ago | 1

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Answered
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'...

30 days ago | 0

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Answered
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...

30 days ago | 0

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Answered
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...

1 month ago | 0

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Answered
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...

1 month ago | 2

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

1 month ago | 1

Answered
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...

1 month ago | 0

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Submitted

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

1 month ago | 8 downloads |

Answered
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')

1 month ago | 0

Answered
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...

2 months ago | 0

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Answered
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...

2 months ago | 0

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Answered
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...

2 months ago | 1

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Answered
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...

2 months ago | 1

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