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Stephen Cobeldick


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6 669 total contributions since 2014

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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...

ungefär 9 timmar 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...

ungefär 10 timmar 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...

ungefär 14 timmar 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...

ungefär 19 timmar 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...

en dag 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...

en dag 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...

2 dagar 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'); ...

2 dagar 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...

5 dagar 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...

6 dagar 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...

8 dagar 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+'); % ...

10 dagar 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

10 dagar 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

10 dagar ago | 0

Submitted


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

13 dagar ago | 9 downloads |

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Submitted


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

13 dagar ago | 5 downloads |

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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)...

13 dagar 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};...

14 dagar 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 ...

15 dagar 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 ...

15 dagar 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',...

15 dagar 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,...

15 dagar ago | 0

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Answered
What does the varargin function do and what does varargin{:} mean?
"What does the varargin function do..." varargin is not a function, it is a cell array which contains any number of optional i...

15 dagar ago | 0

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Answered
Break command doesn't stop the For loop
"Can anybody please explain me why the 'break' command doesn't work in the following code?" Explanation: The reason is because ...

15 dagar ago | 1

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Answered
Reading multiple values from an n*1 cell array.
The most efficient way: >> C = {'3.7482.85813621.44775413.853117-9.113155'; '3.7492.86975821.44393913.816126-9.117885'}; >> M ...

15 dagar ago | 1

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Answered
Formatting the JET colormap
The colormapeditor changes the colormap of the current figure. It does not save or store the colormap in any way. You will most...

15 dagar ago | 1

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Answered
Get textscan to sort the rows as matrices and columns as cells
opt = {'Delimiter',',', 'CommentStyle','@', 'CollectOutput',true}; [fid,msg] = fopen('assignment1.txt','rt'); assert(fid>=3, m...

15 dagar ago | 0

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Answered
How to use multiple variables in a name structure
The most efficient approach is to use sprintf (and is what experienced MATLAB users would do): for k = ... fig_name = spri...

15 dagar ago | 0

Answered
Datetime conversion input format
According to the datetime documentation, the correct format characters for times are: hours: 'HH' or 'hh' (for 24/12 hour clock...

16 dagar ago | 0

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Answered
Extract rows in a Matrix based on column values of another Matrix.
The standard MATLAB approach to this common task is to use the second output of ismember, e.g.: >> [X,Y] = ismember(p,q(:,1)); ...

20 dagar ago | 0

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