Stephen23

Active since 2014

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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); ...

12 hours 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 ...

1 day 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...

1 day 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...

1 day ago | 0

Answered
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 ...

2 days 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

2 days ago | 0

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 days ago | 0

Submitted

Numeric to Ordinal-String
Convert numeric values to a string array of integers with ordinal suffixes. Fully vectorized!

3 days ago | 2 downloads |

Answered
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 days ago | 1

Submitted

Number to Scientific Prefix
Convert a numeric value to SI-prefixed text (aka engineering / metric prefix). Bonus: binary prefixes!

3 days ago | 17 downloads |

Submitted

Scientific Prefix to Number
Convert SI-prefixed text (aka engineering / metric prefix) into numeric values. Bonus: binary prefixes!

3 days ago | 9 downloads |

Answered
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...

4 days 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...

4 days 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)

4 days 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)

5 days ago | 0

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...

5 days ago | 0

Answered
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...

6 days 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...

6 days 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...

6 days 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...

6 days 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....

6 days 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); ...

7 days 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...

7 days ago | 0

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

8 days ago | 0

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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)

9 days ago | 0

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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...

9 days 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] =...

9 days 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...

9 days ago | 1

Answered
Count repetitions separately in an array
A = [1;1;2;2;2;2;2;2;3;1;1;1;1;4;4;4;1;1;1;5;5]; D = diff([0;A;0]==1); B = find(D>0); E = find(D<0); L = E-B X = find(L>2);...

9 days ago | 1

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Answered
How to combine two vectors column-by-column?
A = [1,3,5,7;9,11,13,15;17,19,21,23] B = [2,4,6,8;10,12,14,16;18,20,22,24] C = reshape(permute(cat(3,A,B),[1,3,2]),size(A,1),[...

9 days ago | 1

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