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Remove all the words that end with "ain"
Given the string s1, return the string s2 with the target characters removed. For example, given s1 = 'the main event' your ...

6 years ago

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Return the largest number that is adjacent to a zero
This example comes from Steve Eddins' blog: <http://blogs.mathworks.com/steve/2009/05/27/learning-lessons-from-a-one-liner/ Lear...

6 years ago

Answered
how to sum data with condition
This is silly. But not difficult to implement. x = [1 100; 1 101 ; 1 102; 2 109 ; 2 116 ; 2 118 ; 2 120 ; 3 103; 3 106]; y = x...

6 years ago | 0

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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 ...

6 years ago

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Swap the first and last columns
Flip the outermost columns of matrix A, so that the first column becomes the last and the last column becomes the first. All oth...

6 years ago

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Summing digits
Given n, find the sum of the digits that make up 2^n. Example: Input n = 7 Output b = 11 since 2^7 = 128, and 1 + ...

6 years ago

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Remove any row in which a NaN appears
Given the matrix A, return B in which all the rows that have one or more <http://www.mathworks.com/help/techdoc/ref/nan.html NaN...

6 years ago

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Return the 3n+1 sequence for n
A Collatz sequence is the sequence where, for a given number n, the next number in the sequence is either n/2 if the number is e...

6 years ago

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Alphabetize by last name
Given a list of names in a cell array, sort the list by the last name. So if list = {'Barney Google','Snuffy Smith','Dagwood ...

6 years ago

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How do I break the line for every 50th row in a matrix
Fairly simple. Just need to reshape the variables. Here is an example: d = 10; x = repmat(1:d,1,d)'; y = [sin(x)]; t = 1:len...

6 years ago | 0

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Index 2D matrix along line rotated about the matrix midpoint
360/(N-1) doesn't make sense. What if N = 8? I think you just mean 180. But it's irrelevant. It would not be efficient to recrea...

6 years ago | 0

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Why can't I solve this, it's simple. (Incorrect dimensions.... use .^) (I did then it says Invalid Operator.......)
This works fine: z = ((x+1).^y)-(x.^y); You should read a bit on the difference between array and matrix operations. https://...

6 years ago | 0

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incorrect result of fft phase calculation
There are two issues at play. The first is a trade-off between temporal resolution and spectral resolution. Your sampling freque...

6 years ago | 0

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How to correct error in port width or dimension in simulink?
Reshape the signal going into 'ref' with a Reshape block, and select column vector as the output dimensionality.

6 years ago | 0

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Function for even or odd numbers
function y = iseven(v) y = all(~mod(v,2)); end

6 years ago | 0

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List comprehension-like function in assigning values in nested structures
You'll find the answer in this article on comma-separated lists, specifically with the _deal()_ function. <https://www.mathwork...

6 years ago | 1

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How to stop for-loop outside of the loop?
Sounds like you want a GUI of a stop watch. https://www.mathworks.com/matlabcentral/fileexchange/12628-stopwatch

6 years ago | 0

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Multiple Summation of Series using For Loops
Very close. You need to reset the value of s for each y. I also cleaned it up a bit. This now produces the specified figure. c...

6 years ago | 0

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how i implement this equation.
Why do you want a loop to do this simple equation anyways? Ok here you go... clearvars; Ne = 9; Ni = 100; Eci = rand(Ni,Ne);...

6 years ago | 0

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Answered
Error using odearguments (line 113) Inputs must be floats, namely single or double.
Your function dynamics takes as inputs x and y, but instead uses t and y. So fix that. You are also passing in a symbolic value...

6 years ago | 0

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Find the two nearest points from an array given a value
[~,k] = mink(abs(A-0.1400),2);

6 years ago | 4

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How to filter data using rmoutliers?
If you have a hard threshold you want to use, then rmoutliers is not the function you want. Just use a simple logical index to g...

6 years ago | 1

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Calculate the FFT of an ECG signal
I haven't ran your code but the plot looks pretty normal. The peak you see around 0 Hz is a DC component added to your signal. Y...

6 years ago | 1

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Answered
How vectorize this operation
If you have the signal toolbox, you can use the buffer() command to an array of the x values that you require, then do the matri...

6 years ago | 0

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Unable to perform assignment because the size of the left side is 1-by-1 and the size of the right side is 100-by-1000.
exp(e(time,i))

6 years ago | 0

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Finding change in a large dataset
I agree with what Adam says in that there are certainly more efficient ways to solve this problem. That being said, I didn't hav...

6 years ago | 0

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How do I make gaps in missing data plot lines?
help plot You are the one telling Matlab to plot a line between your data points. Try plot(x,y,'c.')

6 years ago | 0

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using relational operators on array and element
if y>=var1 & y<=var2; var1 = 4 -1 -6 -11 -16 var2 = 6 1 -4 -9 -14 Let's say y = 5, so the condition abo...

6 years ago | 1

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Is there a way to avoid repeating time-consuming calculations from odefun in the events function?
You might find this comment by Walter Roberson useful, where he talks about using memoize().

6 years ago | 0

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peak to peak amplitude comparison
You can't find the peak of a single data point. It is telling you to provide more data points in order for the function to work....

6 years ago | 0

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