Community Profile # Jan Kappen

28 total contributions since 2012

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Question

Creating an array of structs and using the field directly?
Hey guys. I'm wondering if there is a workaround for doing something like this: a = {[struct('field',1) struct('field',2)]....

5 years ago | 2 answers | 0

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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...

5 years ago

Solved

Sum all integers from 1 to 2^n
Given the number x, y must be the summation of all integers from 1 to 2^x. For instance if x=2 then y must be 1+2+3+4=10.

5 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...

5 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...

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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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

Solved

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

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...

5 years ago

Solved

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

5 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...

5 years ago

Question

Nonrectangular grid between two lines
Hey guys, this might be a simple problem but I'm going crazy here: Assume you have two lines or direction vectors r,s from t...

6 years ago | 1 answer | 0

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Question

MEX function is slower than matlab script. Profiling possiblilites?
Hey guys. I am working on a toolbox for realtime classification of driving situations. For this purpose I train a least squares...

7 years ago | 0 answers | 2

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Question

Include libsvm in simulink, s function
Hello guys. I'm wondering how complicated it would be to call libsvm [ http://www.csie.ntu.edu.tw/~cjlin/libsvm/ ] from a si...

7 years ago | 2 answers | 0

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Question

Asynchronous data acquisition & filtering
Hey guys, I need your help again :( Currently I'm using a real time windows target model which receives data via the strea...

8 years ago | 0 answers | 0

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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.

8 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 ...

8 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:...

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

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

8 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...

8 years ago

Question

How to generally use the stream input port in a real-time windows target model?
Hey guys, I'm wondering, how I can use the stream input port (via a generic serial interface) in a real-time windows target m...

8 years ago | 1 answer | 0

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Question

Understanding the rate transition block in realtime windows target
Hey guys, I have a few questions regarding the 'rate transition block' in simulink. I understand, that a fast sampled sign...

8 years ago | 1 answer | 0

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Question

Video processing model can't be compiled by real-time windows target
Hello guys, I've got a strange problem here. What I try to do is creating code for the real-time windows target from a model ...

8 years ago | 2 answers | 0

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Question

Using function handles from *.m file in simulink model
Hey all, I wonder, how i can use functions (or function handles) which are defined in an *.m script file in a simulink model....

8 years ago | 2 answers | 0

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Question

Finding similar symbolic expressions in a vector
Hey guys, i have following problem: Let there be a long vector containing symbolic expressions. To reduce the vector length i...

8 years ago | 1 answer | 0