Stephen Cobeldick

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6,673 total contributions since 2014

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Answered
How to convert a char letter into a double which is still a letter.
The simple MATLAB approach is to use the character code: >> double('t') ans = 116

11 hours ago | 0

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

22 hours 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!

1 day ago | 9 downloads |

Submitted

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

1 day ago | 6 downloads |

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 ...

1 day ago | 0

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Submitted

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

2 days ago | 1 download |

Submitted

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

2 days ago | 18 downloads |

Submitted

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

2 days ago | 4 downloads |

Submitted

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

2 days ago | 6 downloads |

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 ...

2 days 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...

3 days 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...

3 days 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...

3 days 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...

3 days 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...

4 days ago | 0

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...

4 days 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...

5 days 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'); ...

5 days 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...

8 days 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...

8 days 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...

10 days 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+'); % ...

12 days ago | 0

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Answered
How to find minimum value from loop using if function iteration?
>> a = 135500; >> dx = 1000; >> b = floor(a/dx) b = 135

12 days ago | 0

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Answered
How to sort folders in imageDatastore?
https://www.mathworks.com/matlabcentral/answers/416241-how-to-sort-the-files-obtained-by-imagedatastore

13 days ago | 0

Answered
Why I the data processed by the matlab is wrong, it reports three wrong results,what is the reason?All the data and .m files are included ,who can help me?
opt = {'CollectOutput',true }; [fid,msg] = fopen('tem-009.out','rt'); assert(fid>=3,msg) str = ''; while ~strncmp(str,'-',1)...

16 days ago | 0

Answered
For loop in function handle
You can simply store function handles in a cell array of any size and use cellfun. No loop required. >> C = {@sin,@sqrt,@pow2};...

17 days ago | 1

Answered
Changing elements of vector with matrix
No loop required: >> v = 1:numel(a); >> x = any(v>=b(:,1) & v<=b(:,2), 1); % requires MATLAB >=R2016b >> a(x) = 1 a = 1 ...

17 days ago | 1

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Answered
Merge files with the same prefix.
This should get you started (untested, but gives an outline of how you could do this): D = 'path to the folder where the files ...

17 days ago | 0

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Answered
How to sort one array based on another of a different size
As Rik wrote, the MATLAB solution is to use ismember, e.g.: >> A = {'a','a','b','c','c','d','d','d','d','e','e'}; >> B = {'d',...

17 days ago | 1

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Answered
Select first n nonzero elements in each row of matrix
Linear indexing does this simply and efficiently. The trick is to work down the columns, which requires transposing: >> A = [1,...

17 days ago | 0

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