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Stephen Cobeldick


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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...

alrededor de 9 horas ago | 0

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'); ...

alrededor de 12 horas ago | 0

| accepted

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...

3 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...

4 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...

6 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+'); % ...

8 días 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

8 días 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

8 días ago | 0

Submitted


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

11 días 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!

11 días ago | 3 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)...

11 días 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};...

13 días 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 ...

13 días 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 ...

13 días 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',...

13 días 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,...

13 días 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...

13 días 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 ...

13 días 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 ...

13 días 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...

13 días 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...

13 días 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...

13 días 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...

14 días 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)); ...

18 días ago | 0

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Answered
A complicated matrix manipulation
Try this reasonably "simple and efficient way": r = size(A,1); x = nan(r,1); for k = 1:r r1 = find(A(1:k,1),1,'last'); ...

18 días ago | 1

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Answered
Replacing specfic numbers in string
>> substr = {'B0.2Si0.05'}; >> numarray = [0.18432,0.04608]; For one element of the cell array substr: >> spl = regexp(substr...

19 días ago | 2

Answered
Load stored handles data to an other function
"I think that something is missing in this ligne" Actually you already have too much on that line. Try this: DataNeed = handle...

19 días ago | 0

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Answered
How can we convert a datetime into a string that represents a Unix timestamp in nanoseconds?
Warning: this answer delves into undocumented features of the datetime object and relies on my own wild speculation that may be ...

20 días ago | 1

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Answered
What does '* *' mean in matlab?
The double asterisk tells dir to recursively search the provided path, the documentation explains it with "and dir **/*.txt list...

20 días ago | 1

Answered
Incorrect Logical Condition Statement
Leg = 'L'; %change between L and R vnm = sprintf('knee_flex_%s',lower(Leg)); Tables.(vnm) https://www.mathworks.com/help/matl...

21 días ago | 0

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