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Stephen Cobeldick


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6.681 total contributions since 2014

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Answered
How to convert string to datetime format in parquet file format within parquet datastore?
>> D = {'2020/1/1' ;'2020/1/1' ;'2020/1/1' }; >> T = {'00:01:0:0';'00:01:0:60';'00:01:0:320'}; Method one: sscanf and durat...

alrededor de 2 horas ago | 0

Answered
Sorting specific dates from Datetime array
This is easy using datetime and days: >> vd = linspace(days(-2),days(2),10); >> dt = datetime+vd(:) dt = 12-Jul-2020 00:...

1 día ago | 0

Answered
Sort rows of a matrix based on a specific array
>> [X,Y] = ismember(A(:,1),B); >> [~,Z] = sort(Y(X)); >> T = A(X,:); >> A(X,:) = T(Z,:) A = 3 1 1 2 0 0 ...

1 día ago | 1

| accepted

Answered
How to use metacharacters in combination with cell arrays to build up a pattern for regexp?
"my goal is to get the max index of occurence of the string "22" with no other digits or characters before or after it." I assu...

1 día ago | 0

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Answered
Why did I get different print format in the output txt file?
"I am wondering why the alignment of columns when using my old Dell are Not as good as those when used my iMac and new dell." T...

1 día ago | 0

Answered
Giving a Different Value to Elements of Array
Using numbered variables is a sign that you are doing something wrong. In this case, using indexing would allow you to use a lo...

1 día ago | 0

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Answered
Accessing the nth dimension in a variable sized multidimensional array
"...how do I get A(1,1,...,1,:) when I don't know how many dimensions A has?" You use a comma-separated list, which you can eas...

2 días ago | 0

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Answered
Allocating first and last rows from column 2 that correspond to specific criteria in column 1 in a for loop to a new matrix or submatrix
X = [1,0,0,0;1,1,1,0;1,1,1,1;0,1,1,1;0,0,0,1]; N = size(X,2); Y = nan(2,N); for k = 1:N V = find(X(:,k)); Y(:,k) = ...

2 días ago | 0

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Answered
Not enough input arguments
Exactly as the pdepe documentation explains (and its examples show) you need to provide three function handles as its 2nd, 3rd, ...

4 días ago | 0

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Answered
Apply a customized function to cell array
D = cellfun(@RemoveZeroColumnsInCSImatrix, C, 'UniformOutput',false);

5 días ago | 0

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Submitted


Number to Scientific Prefix
Convert a numeric value to an metric prefixed string (SI/engineering). Bonus: binary prefixes!

5 días ago | 11 downloads |

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Submitted


Scientific Prefix to Number
Convert a metric prefixed string into numeric value (SI/engineering). Bonus: binary prefixes!

5 días ago | 7 downloads |

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Answered
Reading image in zig zag, and arrange the output matrix in ascending and descending issue
>> A = [5,13;7,13;6,13;4,14;5,14;8,14;5,16;8,16;7,16;9,16;3,20;6,20;8,20;9,20] A = 5 13 7 13 6 13 4 ...

5 días ago | 0

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Submitted


Words to Number
Convert English number name/s in a string to numeric value/s (GB/US).

6 días ago | 3 downloads |

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Submitted


Number to Words
Convert a number to a string giving the English name of the number value (GB/IN/US).

6 días ago | 4 downloads |

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Submitted


Number to Myriad
Convert a number to a string giving the value using Knuth's Myriad/Yllion naming scheme.

6 días ago | 2 downloads |

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Submitted


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

6 días ago | 8 downloads |

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Answered
How to replace leading zeroes by spaces with regexprep
>> fun = @(c)regexprep(c,'^0+(?=\d)','${char(double($&)-16)}'); >> out = varfun(fun,T) out = Fun_a Fun_b Fun_c ...

6 días ago | 1

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Answered
Open multiple .csv files, process and save them in a structure
You need to fix this line otherwise your loop will only iterate once: for i = 1:length(filename) % ^ this must be a col...

7 días ago | 0

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Answered
Shuffling numbers while keeping identical numbers next to each other
>> A = [1,1,2,3,3,4,6,6,6,6]; >> X = diff(find([1,diff(A),1])); >> C = mat2cell(A,1,X); >> Y = randperm(numel(C)); >> V = [C...

7 días ago | 1

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Answered
Dynamic call to structure elements
You can trivially access the fields of a structure using this syntax, where F is the fieldname: S.(F) See: https://www.mathwor...

7 días ago | 0

Answered
MATLAB example not working.
Typical reasons why that function might not work: scatteringchanmtx was introduced in R2017b. It will not work with earlier MAT...

7 días ago | 0

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Answered
How to use varargin and varargout?
As their documentation explains, both varargin and varargout are cell arrays. So if required (e.g. to perform numeric operations...

8 días ago | 0

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Answered
Data types of arrays in a function
B = int8(A); if any(B(:)~=A(:)) B = A; end Note that this is a more versatile approach because it does not use hard-code...

8 días ago | 0

Answered
Merge specific text files
You will need two loops, the outer loop for M1, M2, etc, and the inner loop for the files R1,R2,R3,...R100, e.g.: D = 'path to...

9 días ago | 0

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Answered
Who could get all the data in the attached file by the matlab?
>> rgx = '([-+]?\d+\.?\d*([eE][-+]?\d+)?)'; >> str = fileread('tem-001.txt'); >> tkn = regexp(str,[rgx,'\s+',rgx],'tokens'); ...

9 días ago | 0

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Answered
Trying to create a set of matrixes using a for loop. I have an error on line 23: Array indices must be positive integers or logical values. Basically making matrixes labeled ke1, ke2, ke3...
There are multiple issues with your loop: you are attempting to use invalid indices (e.g. 0, pi/2, etc.). you are providing fo...

11 días ago | 1

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Answered
i have a variable in my workspace and i dont know its name directly
Do not load directly into the workspace, always load into an output variable (which is a scalar structure): S = load(...); The...

12 días ago | 0

Answered
Extract number and infromation from multiple image files ?
One simple regular expression does this quite efficiently: D = 'Defolder'; S = dir(fullfile(D,'*.jpg')); N = {S.name}; T = r...

14 días ago | 1

Answered
Add lines (data) to a fopen file without overwriting the previous data
Try the append option: https://www.mathworks.com/help/matlab/ref/fopen.html#btrnibn-1-permission NS = fopen(... ,'a+'); % ...

16 días ago | 0

| accepted

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