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Paolo


118 total contributions since 2018

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Answered
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

Answered
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

Answered
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

Answered
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

Answered
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...

circa un anno ago | 0

Answered
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))...

circa un anno ago | 1

| accepted

Answered
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...

circa un anno ago | 0

Answered
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))-...

circa un anno ago | 0

| accepted

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

circa un anno ago | 0

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Answered
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...

circa un anno ago | 0

| accepted

Answered
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 >= ...

circa un anno ago | 0

| accepted

Answered
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');...

circa un anno ago | 0

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Answered
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'...

circa un anno ago | 1

| accepted

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

circa un anno ago | 2

Answered
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)

circa un anno ago | 0

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

circa 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...

circa un anno ago

Answered
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); ...

circa un anno ago | 0

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

circa un anno ago | 0

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

circa un anno ago | 0

| accepted

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

circa un anno ago | 1

| accepted

Answered
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...

circa un anno ago | 0

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Answered
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; ...

circa un anno ago | 0

| accepted

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

circa un anno ago | 1

Answered
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,:) = [];

circa un anno ago | 0

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

circa un anno ago | 1

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Answered
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...

circa un anno ago | 0

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Answered
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.

circa un anno ago | 0

Answered
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...

circa un anno ago | 0

| accepted

Answered
How do I find no. of instances of each value till it changes?
This can be achieved nicely with regular expressions. Capture a digit and backreference back to the same digits to find the patt...

circa un anno ago | 0

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