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Count number of indexes for each consecutive values in column of array
>> V = [0 0 1 1 1 0 0 0 0 0 1 1 1 1 1 1 1 1 1 0 0 0]; >> D = diff([0;V(:);0]); >> find(D<0)-find(D>0) ans = 3 9

6 years ago | 0

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Answered
What should I do to display midnight in datetime?
>> dt = datetime(2019,9,8,0,0,0,'Format','yyyy-MM-dd HH:mm:ss') dt = 2019-09-08 00:00:00

6 years ago | 0

Answered
How can I writetable to cell array
Where C is your cell array: for k = 1:numel(C) F = sprintf('file_%d.CSV',k); writetable(C{k},F) end This just follo...

6 years ago | 0

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Answered
Dynamic vectors into cell
It is very easy to get what you want, you just need to avoid concatenating all of the numeric/logical data together, e.g.: >> D...

6 years ago | 0

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Answered
Using cellfun and regexp question
The simple and efficient solution is to use the 'once' option: sampleRates = regexp(storedSamplerates,'\d+','match','once'); %...

6 years ago | 3

Answered
what is the best possible way to find the missing values using interpolation
>> a60 = [1,5,9,13,17,21]; >> t60 = 60*(0:numel(a60)-1); >> t15 = t60(1):15:t60(end); >> a15 = interp1(t60,a60,t15) a15 = ...

6 years ago | 0

Answered
convert period (.) to colon (:) for reading time
I don't see why you need to convert any characters, MATLAB imports that format without error: >> str = '2020-07-29 14.42.32'; ...

6 years ago | 1

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how to remove rows and columns in cell array ?
Where C is your cell array: C(25419:29317,:) = []; You could also detect those rows automatically: X = all(cellfun(@isempty,C...

6 years ago | 1

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Answered
Passing variable from anonymous objective function to main workspace
You can do this easily with nargin: function val = objfun(x,v1,v2) persistent data if ~nargin val = data; return e...

6 years ago | 1

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Answered
complex repeating input format
fmt = repmat('%f%s%s%s%s',1,97); fmt = ['%s%f%f%f%f%s',fmt]; Note that you wrote "First 5 columns..." but your example format ...

6 years ago | 1

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Answered
Convert a fixed width char array into a column vector
This will be quite efficient: >> aa = ' 1703434 42 1012275140184521401845314018473'; >> vec = sscanf(sprintf('%c%c%c%c%c%...

6 years ago | 1

Answered
convert 1x1 Cell with scientific number as text to a number in MATLAB.
Just use the correct indexing for accessing the contents of a cell array: E1 = T{1,2}; https://www.mathworks.com/help/matlab/m...

6 years ago | 1

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Answered
Callback Push Button Execution
"...and to me I originally thought one of these two should have happened..." What actually occurs is described in the MATLAB do...

6 years ago | 0

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Answered
Converting a 2d matrix into a 3d matrix
Depending on how you want them arranged in the new array, either test1 = reshape(test,4,6,10); or test1 = permute(reshape(tes...

6 years ago | 0

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Answered
Error: EXTRAPVAL must be a scalar
According to the interp2 documentation, the extrapval must be a scalar numeric: https://www.mathworks.com/help/matlab/ref/inter...

6 years ago | 0

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Answered
Extract a column of a matrix created by a command
MATLAB does not generally support indexing** directly into the output of functions or operations. The usual solution is to alloc...

6 years ago | 0

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vertically concatenate struct values from the same field
V = vertcat(S1.vals) V = vertcat(S1(1:10).vals) https://www.mathworks.com/help/matlab/matlab_prog/comma-separated-lists.html ...

6 years ago | 0

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Answered
Using fprintf to display multiple strings
Very simply add an identifier to the format specifier: fprintf('%1$s + %1$s',char(955)) % ^^ ^^ input...

6 years ago | 0

Answered
imshow() black for max value and white for min value?
Assuming that the image array A contains values in the range 0-1: imshow(1-A)

6 years ago | 0

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Answered
How to accelerate the process of `find` in large for loop ?
>> [X,Y] = ismember(A,B); >> [~,Z] = sort(Y(X)); >> V = find(X); >> R = reshape(V(Z),2,[]).' R = 2 9 4 8 5 ...

6 years ago | 0

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Answered
Storing integers from a cell in a variable
Much more efficient than cellfun: >> C = {'(4,4)';'(3,4)';'(2,4)';'(1,4)';'(0,4)';'(-1,4)';'(-2,4)'}; >> V = sscanf([C{:}],'(%...

6 years ago | 1

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Answered
Unable to perform assignment with 0 elements on the right-hand side.
The actual problem is that you think that one (or more) of these values match: app.AccelSNEditField == mergetables{:,1} In fac...

6 years ago | 1

Answered
Error with Uniquetol: " Repetitive numbers not being removed"
Set the tolerance to a suitable value, e.g.: >> uniquetol(GlobalNMesh,1e-3) ans = 0 0.0336 0.1199 0.1331

6 years ago | 0

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Answered
Combining matrices from workspace or from directory into a single matrix.
Assuming that each .mat file contains exactly one array with compatible sizes: D = 'path to the directory where the files are s...

6 years ago | 1

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Answered
mapping of datas in -pi to pi to 0 to 2*pi
mod(data,2*pi)

6 years ago | 0

Answered
Extracting a specific digit from a float w/o floating-point implementation rounding issues
Some people will incorrectly tell you that this is not possible, but in reality there is a simple and efficient solution: >> N ...

6 years ago | 0

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Answered
How to replace a word with another word in a cell array (case insensitive)
Method one: loop and regexprep: for k = 1:numel(withthis) str = regexprep(str,replaceword,withthis{k},'once','ignorecase')...

6 years ago | 1

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Answered
How can I add data to an existing array when the dimension do not agree?
Just use indexing to specify how many elements you are allocating to. MATLAB will expand the array to fit: >> B = ['ABC';'DEF']...

6 years ago | 0

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Answered
cell2mat Error :using cat Dimensions of arrays being concatenated are not consistent.
%P2 = {0,[1;2];0,0}; % test data P2 = Numerical_FourierForce{1,1}; X = cellfun(@(a)isequal(a,0),P2); P2(X) = {[0;0]}; P2 = c...

6 years ago | 0

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Answered
Breaking data from a large text file into groups
"I just need to determine the group with the highest number of elements and output that list only." So for your example data th...

6 years ago | 1