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Stephen Cobeldick


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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...

約3時間 前 | 1

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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...

約20時間 前 | 0

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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...

3日 前 | 1

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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+'); % ...

5日 前 | 0

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

5日 前 | 0

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

5日 前 | 0

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

8日 前 | ダウンロード 9 件 |

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

8日 前 | ダウンロード 4 件 |

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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)...

8日 前 | 0

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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};...

10日 前 | 1

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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 ...

10日 前 | 1

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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 ...

10日 前 | 0

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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',...

10日 前 | 1

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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,...

10日 前 | 0

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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...

10日 前 | 0

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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 ...

10日 前 | 1

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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 ...

10日 前 | 1

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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...

10日 前 | 1

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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...

10日 前 | 0

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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...

10日 前 | 0

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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...

11日 前 | 0

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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)); ...

15日 前 | 0

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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'); ...

15日 前 | 1

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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...

16日 前 | 2

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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...

16日 前 | 0

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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 ...

17日 前 | 1

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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...

17日 前 | 1

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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...

18日 前 | 0

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find the multiple max values
Where M is your matrix: >> U = unique(M(:)); >> X = ismember(M,U(end-2:end)); >> M(~X) = 0 M = 0 0 44 0 44 ...

18日 前 | 0

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Import name/value parameters from a text file to a struct (or cell array)
As far as I am aware there isn't anything inbuilt. But you can do something like this: >> str = fileread('myparamfile.txt'); >...

18日 前 | 0

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