Community Profile

# Ken Campbell

72 total contributions since 2006

http://www.campbellmusclelab.org

Professional Interests: Time series analysis, Stochastic modeling, Image analysis, Differential equations, Data acquisition, Controlling experimental apparatus

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Question

Is there an efficient method to remove leading underscores from a cell array of strings?
Given a={'rose','_tulip_blue','lilac','_daisy'} is there an efficient way of stripping the leading underscores to give ...

2 years ago | 2 Answers | 0

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Make a checkerboard matrix
Given an integer n, make an n-by-n matrix made up of alternating ones and zeros as shown below. The a(1,1) should be 1. Example...

4 years ago

Solved

The Hitchhiker's Guide to MATLAB
Output logical "true" if the input is the answer to life, the universe and everything. Otherwise, output logical "false".

4 years ago

Solved

Wheat on a chessboard pt 1
If a chessboard were to have wheat placed upon each square such that one grain were placed on the first square and each successi...

4 years ago

Solved

Check if sorted
Check if sorted. Example: Input x = [1 2 0] Output y is 0

5 years ago

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...

5 years ago

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Weighted average
Given two lists of numbers, determine the weighted average. Example [1 2 3] and [10 15 20] should result in 33.333...

5 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...

5 years ago

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Pizza!
Given a circular pizza with radius _z_ and thickness _a_, return the pizza's volume. [ _z_ is first input argument.] Non-scor...

5 years ago

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 ...

5 years ago

Solved

Select every other element of a vector
Write a function which returns every other element of the vector passed in. That is, it returns the all odd-numbered elements, s...

5 years ago

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

5 years ago

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Determine if input is odd
Given the input n, return true if n is odd or false if n is even.

5 years ago

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Make the vector [1 2 3 4 5 6 7 8 9 10]
In MATLAB, you create a vector by enclosing the elements in square brackets like so: x = [1 2 3 4] Commas are optional, s...

5 years ago

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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 ...

5 years ago

Solved

Find the sum of all the numbers of the input vector
Find the sum of all the numbers of the input vector x. Examples: Input x = [1 2 3 5] Output y is 11 Input x ...

5 years ago

Solved

Times 2 - START HERE
Try out this test problem first. Given the variable x as your input, multiply it by two and put the result in y. Examples:...

5 years ago

Responded

Re: PDFs on the Mac look interpolated--why?
I don't know if this will help with your specific question, but have you tried export_fig? It's simplified a lot of the issues I...

5 years ago | 6453 views

Posted

Using the system command to launch a multi-threaded PC executable
I have a Windows executable file that runs stochastic simulations as separate threads and then averages the results together at ...

5 years ago | 1271 views

Responded

Re: Tracking of contours in noisy ultrasound image
Loram and Lakie have a paper in the Journal of Applied Physiology about analyzing ultrasound movies. I don't have the citation t...

6 years ago | 3534 views

Responded

Re: How to vectorize this?
Brilliant - thanks. I didn't know / perhaps had forgotten? that syntax. Ken

6 years ago | 1407 views

Posted

How to vectorize this?
Can anyone suggest a way of vectorizing this? a=rand(4,1); for ii=1:4 end Thanks in advance, Ken

6 years ago | 1407 views

Responded

Re: How can I find a slope of a line in a image with Mathlab
Other people will have better ways (if they answer) but a simple way of doing this might be: 1) Read in the image (doc imread) ...

7 years ago | 11185 views

Responded

Re: symmetric matrix
I'm a little surprised that there isn't a MATLAB built-in function "issymmetric". There seem to be at least 50 other is-somethin...

7 years ago | 45599 views

Responded

Re: symmetric matrix
I'm a little surprised that there isn't a MATLAB built-in function "issymmetric". There seem to be at least 50 other is-somethin...

7 years ago | 45599 views

Responded

Richard Crozier" <r.crozier@ed.ac.uk> wrote in message > <snip> This seems like a great idea to me too. It would be really g...

7 years ago | 16252 views

Responded

Re: MATLAB on GPUs
I'm interested in the general idea of using GPUs to speed up calculations but I didn't immediately think of using Matlab as a 'c...

7 years ago | 16970 views

Responded

Re: MMPOLAR Update
It would appear that you can (or at least could several years ago) register the toolbox (\$30) to see the source. See this link. ...

8 years ago | 13000 views

Responded

Re: fminsearch, parallel computing
You might also want to look into particle swarm optimization. It is easy to run this in parallel because the function evaluation...

8 years ago | 6520 views

Responded

Re: Mex with LAPACK/BLAS: "The specified procedure could not be found"
I got out of my depth with a similar situation a year or so back. My recollection is that I got my executable code to work by ma...

8 years ago | 3653 views