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# Paolo

118 total contributions since 2018

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How to slice each string in a string array without using for loop
str2double(regexp(celldata,'(?<=-)\d+(?=-)','match','once')) ans = 12 11 9

circa un anno ago | 1

how do I extract part of a cell of string values?
You could loop over it: arr = {"201808250100","201808250104"} f=cellstr(arr); cellfun(@(x) x(end-3:end),f,'un',0) ...

circa un anno ago | 0

Import .txt data into CELL ARRAY
Try something like this: raw = fileread('mytextfile.txt'); [~,tok]=regexp(raw,'([A-Z][a-z]+).*?(\[.*?(?=[ ,][A-Z}]))','m...

circa un anno ago | 0

returning differences between two matrices
You can use <https://www.mathworks.com/help/matlab/ref/setdiff.html setdiff>: [~,ia] = setdiff(A,B)

circa un anno ago | 0

How do I find the biggest difference in an array?
>> A=[62 1 0]; >> max(reshape((diff(perms(A))),1,[])) 62 >> A = [62, 10, 18, 100, 4, -300]; >> max(reshape((diff...

oltre un anno ago | 0

How to get row indices of names ends with specified common substring
rowIdx=find(endsWith(names,pattern)) For previous versions: rowIdx=find(cellfun(@(x) strcmp(x(end-1:end),'_A'),names))...

oltre un anno ago | 1

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problem with coding cumsum statement
A few things here. First of all, you can't apply cumsum because, as MATLAB is telling you, the data is not numeric. When you are...

oltre un anno ago | 0

How to create a vector from a loop?
Simply preallocate and then write to the column vector: v = zeros(size(M,2),1); for i = 1:size(M,2) v(i,1)= (M(i,3))-...

oltre un anno ago | 0

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extracting numbers from a cell
d = SP{:} >>[d{1}{:}] 1 4 5 6

oltre un anno ago | 0

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Keep specific column variables and delete others?
Var1 = {'Sanchez';'Johnson';'Li';'Diaz';'Brown'}; Var2 = [38;43;38;40;49]; Var3 = logical([1;0;1;0;1]); T = table(V...

oltre un anno ago | 0

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how to extract certain data points from a long array based on certain criteria
veh_velo = [0,0,1,3,7,9,11,15,18,20,19,19]; accel_pedal = [0,0,2,4,6,9,10,11,12,13,13]; accel_pedal(veh_velo >= ...

oltre un anno ago | 0

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listing folders in directory with specific strings
You can work around it with a dos command: [status,cmdout] = dos("dir *") list = regexp(cmdout,'\d{6}-[A-Za-z]+','match');...

oltre un anno ago | 0

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How can I define a variable with a name based on an input?
If I am understanding your question correctly, you can use: ship_name = input('Name of the ship: ','s'); assignin('base'...

oltre un anno ago | 1

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Extract Variables from mixed string
You can use: mystring = '# Message: onset_pic1_8.png'; matches = regexp(mystring,'\d|[a-z]+(?=_|\d)','match') >>mat...

oltre un anno ago | 2

How to get sum of a range
You want to use the OR operator here and not the AND. Use: nnz(v<2 | v>4)

oltre un anno ago | 0

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how to delete row and column at a single command????????????
A(:,2:2:4) = []; A(2:2:4,:) = [];

oltre un anno ago | 0

Solved

Determine whether a vector is monotonically increasing
Return true if the elements of the input vector increase monotonically (i.e. each element is larger than the previous). Return f...

oltre un anno ago

Read data from a .txt file with two columns
If you want a cell array you can use: fileID = fopen('mytext.txt'); mydata = textscan(fileID,'%f%f','HeaderLines',1); ...

oltre un anno ago | 0

Problem 10 of MATLAB cody challenge
You can use: all(diff(x)>0)

oltre un anno ago | 0

How to clear out rows of zeros in a matrix?
Let a be your matrix: a(a(:,1)==0,:) = [];

oltre un anno ago | 0

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converting cells with strings inside cells into strings inside cells
cellfun(@(x) regexp(x,'(?<=@)(.*)(?=@)','match'),array_of_strings) Or cellfun(@(x) regexp(x,'(?<=@)(.*)(?=@)','tokens','...

oltre un anno ago | 1

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How to plot the occurency of an element?
For the vector a you specified period should be 1:8. Use: period = [1:8]; a = [1 1 1 2 3 3 6 6 6 6 6 7 8 8]; n = histcou...

oltre un anno ago | 0

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If I have a matrix My matrix is: BB = [-1 5 6;4 -3 2;5 6 -7]. How to print only positive values using a while loop?
>> BB(BB>0)' ans = 4 5 5 6 6 2 if you must use a loop: ii = 1; BB = [-1 5 6;4 -3 2; ...

oltre un anno ago | 0

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How do I count the number of new occurrences of a number in an array?
nnz(diff([0 (x==1)])==1)

oltre un anno ago | 1

How to filter out rows with NaNs from one variable and the same rows from another variable without NaNs.
indx = isnan(Y); Y(indx) = []; X(indx,:) = [];

oltre un anno ago | 0

Convert serial number dates to month and year
mydate = datetime(736473,'ConvertFrom','datenum','Format','yyyy-MM')

oltre un anno ago | 1

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Accessing multiple logical array indexing results at the same time
If I am understanding correctly the following code should solve your problem: test = magic(4); equalToTwo = find(test == 2...

oltre un anno ago | 0

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how can i count a cell in a randi vector
histcounts(randi(4,1,50)) The output of the function is the occurrences of numbers one to four respectively.

oltre un anno ago | 0

Why does can't I assign number greater than 1 to a matrix?
~eye(3) returns a logical array. You must convert it to double. Use: logicalMat = ~eye(3); myMat = double(logicalMat); m...

oltre un anno ago | 0

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