Answered
How to find the area of a triangle given 3 vertices?
# Pick one vertex, let say V1, as "origin" # Get the two vectors of from this point to the other two points (V2-V1) and (V3-V1)...

8 years ago | 1

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Answered
How to add a row matrix to all other rows of a matrix?
Why not use simple concatenation? First transpose the row-vector into a m-by-1 column vector, of course: NewVarLasten = [Va...

8 years ago | 0

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Answered
How to gracefully terminate continiuous script?
Rik provided a nice solution. If you do not have a GUI you might be able to use my STOPLOOP function in your code (which creates...

8 years ago | 0

Answered
Find indices in cell array
A = {[-1 0 0 -1],1:4,[1 -1 1 -1 1 -1]} % example array fhFind = @(x) find(x == -1) ; IDX = cellfun(fhFind ,A,'un',0) ...

8 years ago | 0

Answered
Iterative plot, stop when lines intersect.
Comparing two numbers is always tricky. I suggest to use a tolerance, so instead of if x==y, ... use if (abs(x-y) <...

8 years ago | 0

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Answered
How do you find whether all the indices in a cell array contain a range of values? Outputs either 1 or 0 for each cell..
Define an anonymous function that does this for a numerical array CheckFcn = @(V,minV, maxV) all(V(:) > minV & V(:) < maxV)...

8 years ago | 0

Answered
how to run a while loop until esc is pressed?
I, the author of stoploop, suggest the function STOPLOOP: <https://uk.mathworks.com/matlabcentral/fileexchange/20455> ;)

8 years ago | 1

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Answered
list the result of the index values in ranges
A = [1 1 2 2 3 3 2 2 1 1]; X = arrayfun(@(k) find(A==k),1:3,'un',0) ; Y = cellfun(@(v) [v([true diff(v) > 1]) ; v([diff(...

8 years ago | 0

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Answered
Permutations Cycles Counting ... speed up
This is upto 10 times faster than your code (and indeed about 100 times faster than my previous code): [nR, nE] = size(p) ;...

8 years ago | 0

Answered
Permutations Cycles Counting ... speed up
Not vectorised, but less checking, not sure if it is faster nR = size(p,1) ; count2 = zeros(nR,1) ; tf = ~isnan(p) ; ...

8 years ago | 0

Answered
How can i obtain a signal like this? i have some problem with the code.
T = 1 ; n = 5/2 ; t = linspace(0,n*T,1000) ; x = sin(2*pi*t/T + pi) ; q = t < T/2 | t > T ; x(q) = 0 ; plot(...

8 years ago | 1

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Answered
Undefined function or variable
Did you add the folder holding these functions to your path (and saved it)?

8 years ago | 0

Answered
How do I take a table which has one value for every hour and produce an average for hours X:Y, one for each day?
Bin the times using HISTC and get the indices. Then accumalate the values using ACCUMARRAY. An example: % data : [time valu...

8 years ago | 0

Solved

Find all elements less than 0 or greater than 10 and replace them with NaN
Given an input vector x, find all elements of x less than 0 or greater than 10 and replace them with NaN. Example: Input ...

8 years ago

Solved

Column Removal
Remove the nth column from input matrix A and return the resulting matrix in output B. So if A = [1 2 3; 4 5 6]; and ...

8 years ago

Solved

Add two numbers
Given a and b, return the sum a+b in c.

8 years ago

Solved

Is this is a Tic Tac Toe X Win?
For the game of <https://en.wikipedia.org/wiki/Tic-tac-toe Tic Tac Toe> we will be storing the state of the game in a matrix M. ...

8 years ago

Solved

surrounded matrix
With a given matrix A (size m x n) create a matrix B (size m+2 x n+2) so that the matrix A is surrounded by ones: A = [1 2 ...

8 years ago

Solved

Back to basics 21 - Matrix replicating
Covering some basic topics I haven't seen elsewhere on Cody. Given an input matrix, generate an output matrix that consists o...

8 years ago

Solved

How to subtract?
* Imagine you need to subtract one number from another using MATLAB. * You will not be using eval for this task. * Given two A...

8 years ago

Answered
How to adjust the ratio to compare the data in two variables?
You can transform your data linearly into, for instance, z-scores, to get a "normal" range of values. This does *not* change the...

8 years ago | 0

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Answered
How can I replace -9999 values by NaN throughout a 2-dimensional table
Read the file into a matrix M, and replace -9999 by NaNs using M(M==-9999) = NaN ;

8 years ago | 2

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Answered
count the last columns in matirix
Last10Columns = MyMatrix(:,end-9:end) or to be safe, if your Matrix has occasionally less then 10 columns: Last10Colum...

8 years ago | 0

Answered
How to get handles of a legend that was automatically generated?
H = findobj('type','legend') H.Location = 'best'

8 years ago | 5

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Answered
Create array with 7500 1s, 5000 2s, 8003s etc.
help repmat help cat help reshape help histogram

8 years ago | 0

Answered
Expanding Matrix with Integers (between decimal numbers)
Almost there, use the function interp1: T = [ 39.01; 41 ;43.13;45; 47.02] V = [19.47;9;11.84;13.35;11.70] ...

8 years ago | 1

Answered
Vectorised cell search and logical indexing
regex can work on a cell array of strings directly: block_new = {'abcd=x','abcd','a=xbc=x'} index4 = regexp('block_new',...

8 years ago | 0

Answered
How do I duplicate a row in a randomly ordered array?
A suggestion: [SF, TF, D] = ndgrid([1 2 3], [10 20 30 40], [180 360]) % combinations three spatial and four temporal freque...

8 years ago | 0

Answered
Adding noise to a sine wave
The expression "v.alpha" is interpreted by matlab as the contents of the _field_ "alpha" of the _structure_ variable "v". This...

8 years ago | 0

Answered
how to create an m-file that will allow user to input password 5 times. After that, it will display a 3x3 matrix with random numbers and if unable to access password it will display the word "wrong password" with decreasing number of attempts
help input help isequal help while help display

8 years ago | 0