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# Chris

### Univ of Hertfordshire

31 total contributions since 2007

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Create times-tables
At one time or another, we all had to memorize boring times tables. 5 times 5 is 25. 5 times 6 is 30. 12 times 12 is way more th...

4 years ago

Solved

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

4 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...

4 years ago

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Is my wife right?
Regardless of input, output the string 'yes'.

4 years ago

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Finding Perfect Squares
Given a vector of numbers, return true if one of the numbers is a square of one of the other numbers. Otherwise return false. E...

4 years ago

Solved

Fibonacci sequence
Calculate the nth Fibonacci number. Given n, return f where f = fib(n) and f(1) = 1, f(2) = 1, f(3) = 2, ... Examples: Inpu...

4 years ago

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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...

4 years ago

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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

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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...

4 years ago

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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 ...

4 years ago

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Triangle Numbers
Triangle numbers are the sums of successive integers. So 6 is a triangle number because 6 = 1 + 2 + 3 which can be displa...

4 years ago

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

4 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.

4 years ago

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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 ...

4 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...

4 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 ...

4 years ago

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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...

4 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:...

4 years ago

Responded

Re: Remove indents from block of code
Both of the above work - thanks very much indeed :)

6 years ago | 9031 views

Posted

Remove indents from block of code
Is there an inverse to the way you can press tab to indent a selection of code?

6 years ago | 9031 views

Responded

Re: GUI crash when scrolling through plots
I found a solution. If anyone else is interested, use: set(handles.sliderName,'enable','off'); plot(.....) set(handles.sliderN...

6 years ago | 3084 views

Posted

GUI crash when scrolling through plots
I've written a GUI that displays recorded data from a matrix of 500x1024 The plot is a bar of the 1024 data points. As you dra...

6 years ago | 3084 views

Responded

Re: Why is MOVEFILE so slow?
I suspect there is some dependence on the number of files in the directory you are moving files from. I'm trying to use matlab ...

7 years ago | 10941 views

Posted

c++ Math Library
Hi I'm using C++ to run an operation that involves multiplying large matricies (well, vector of vectors) on a cell by cell basi...

7 years ago | 3504 views

Responded

Re: Vectorizing - filling arrays
That seems to do exactly what I'm looking for! I'll have a play around over the weekend, thanks very much for that :)

8 years ago | 1522 views

Posted

Vectorizing - filling arrays
Hi I need to fill a rather large array, with a particular set of data. At the moment I'm using loops, and it's very slow, so I...

8 years ago | 1522 views

Posted

Coloring a bar3 plot
Quick (hopefully!) question: I've got a 2d matrix of numbers, Z. When I do bar3(Z) I get a nice 3d bar plot. Now, I have anot...

8 years ago | 2436 views

Responded

Re: pcolor edges
You're a star, thanks for that!! The tips about using 'set' and showing the M code are excellent, and much appreciated. I've...

8 years ago | 14921 views

Posted

pcolor edges
Hi, I'm trying to get a pcolor plot to plot without the edges to each bin. I've got a 180x180 array (called P), and using the ...

8 years ago | 14921 views

Responded

Re: Multiplying different sized matricies
That'll do it, thanks!! :-)

9 years ago | 1637 views