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# Yannick

### MathWorks

29 total contributions since 2013

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my program not work
One problem is that you define n as a vector of values. When you then plug it into an and bn, it is trying to do matrix multipli...

6 years ago | 0

Segment nodes in an image
See if this example helps: <http://www.mathworks.com/help/images/examples/measuring-angle-of-intersection.html Measuring Angle o...

6 years ago | 0

I want to save an array which change its size at each iteration in a loop so that I can plot later on
Hi, you can do a few things: * Use |<http://www.mathworks.com/help/matlab/ref/save.html SAVE>| and |<http://www.mathworks.com...

6 years ago | 0

The command is working perfectly in the command window but not as a script
Just to close the loop on this, the bottom line is that MATLAB file names, just like MATLAB variable or function names, can only...

6 years ago | 1

Creating indivdual column vectors based off a location vector
Hi, here's a way to do it using <http://www.mathworks.com/help/matlab/ref/arrayfun.html ARRAYFUN>: initialIndices = locat...

6 years ago | 0

How can I compute numerical integration from a multivariate function ( f(t,C) ) where C'=[c_1,c_2,...,c_m] with respect to " t "
Hi - a few things: * |<http://www.mathworks.com/help/symbolic/int.html INT>| is a Symbolic Math Toolbox command, so it will t...

6 years ago | 0

How can I average multiple matrices by element, ignoring NaN values, to create a new matrix of the same size?
Hi, if you have Statistics Toolbox, you can use |nanmean| as follows: matrixA = [2 3 5 ; 3 NaN 1 ; 2 4 3]; matrixB =...

6 years ago | 3

| accepted

A question regarding matrices
Here's another option using TEXTSCAN. Note also the illustration of SPARSE and FULL at the end of the code. The main difficulty ...

6 years ago | 0

Mouse Down Function doesn't work
Hi, When you are clicking on the picture, you are actually hitting the "image" object created by imshow, and not the axes "ax...

6 years ago | 4

| accepted

How to show a 4 Dimensional Plot

6 years ago | 0

| accepted

Solved

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...

7 years ago

Solved

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...

7 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...

7 years ago

Solved

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...

7 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...

7 years ago

Solved

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

7 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...

7 years ago

Solved

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...

7 years ago

Solved

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...

7 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 ...

7 years ago

Solved

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...

7 years ago

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

7 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 ...

7 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...

7 years ago

Solved

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

7 years ago

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

7 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 ...

7 years ago

Solved

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...

7 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:...

7 years ago