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# Christopher Creutzig

### MathWorks

193 total contributions since 2011

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Script doesn't seem to be execute properly
In your code, you spend a lot of time computing the same prime over and over again. Do not start the search at a+1 for the secon...

environ un an ago | 3

Question on running fitlda
Gibbs sampling involves stochastic elements (i.e., a pseudorandom number generator), meaning reproducing exactly the results of ...

environ un an ago | 1

| accepted

Changing varibles in a Matrix to Values
Assigning values to MATLAB variables does not affect symbolic expressions that have variables of the same name inside. Use the s...

environ un an ago | 0

multivariable dsolve. Can it be solved for multivariables?
You are trying to solve a PDE (partial differential equation), but dsolve only handles ODEs (ordinary differential equations), w...

environ un an ago | 1

How to find mutual words in title field?
If I read the question correctly, you are looking for a co-occurence matrix. You can get those from a bag-of-Words model by a ma...

environ un an ago | 0

computing frequency*rank
Assuming we have t = topkwords(bag,100); You can get frequency*rank as: t.FreqTimesRank = (1:size(t,1)).*t.Count; And you ca...

environ un an ago | 0

| accepted

Does the text analytics toolbox allow users to test out-of-sample perplexity with LDA?
The second output of logp gives you the perplexity. txt = extractFileText('sonnets.txt'); sonnets = split(txt,[newline newline...

environ un an ago | 0

| accepted

Code for text mining through Bayes Classifier?
MathWorks has examples like this one using classifiers from the Statistics and Machine Learning Toolbox to work on text data. Th...

environ un an ago | 0

how to create a function that counts all words in a document?
Check out the bagOfWords class in Text Analytics Toolbox. It solves exactly this problem. (You may want to have some preprocess...

environ un an ago | 0

how to find most common words in text by matlab
Finding the most common words is easy with Text Analytics Toolbox: >> sonnets = extractFileText("sonnets.txt"); >> sonnets = e...

environ un an ago | 2

| accepted

How to fucntions like plot f(x,y) = 2 when 0<=x<=1 and 0<=y<=x
If the region to plot over were a simple 0 ≤ x ≤ 1 and 0 ≤ y ≤ 1, you could use |fimplicit(f(x,y) - 2, [0 1 0 1])|. I don't thin...

presque 2 ans ago | 0

| accepted

Int vs Integral; Int giving wrong results
As the documentation says down in the “Tips” section, |int(f,1,S)| assumes that |1 ≤ S|. In that region, your input function is ...

presque 2 ans ago | 1

measuring term frequency of words
See <https://www.mathworks.com/help/textanalytics/ref/bagofwords.html the |bagOfWords| documentation>. E.g., you can use the |tf...

environ 2 ans ago | 0

| accepted

Solved

5th Time's a Charm
Write a function that will return the input value. However, your function must fail the first four times, only functioning prope...

environ 2 ans ago

Solved

Sums of Distinct Powers
You will be given three numbers: base, nstart, and nend. Write a MATLAB script that will compute the sum of a sequence of both ...

environ 2 ans ago

Solved

"Cody" * 5 == "CodyCodyCodyCodyCody"
*Alice*: What? *"Cody" * 5 == "CodyCodyCodyCodyCody"*? You've gotta be kidding me! *Bob*: No, I am serious! Python supports...

environ 2 ans ago

Solved

Acid and water
&#9878; &#9878; &#9878; &#9878; &#9878; &#9878; &#9878; &#9878; Assume that there is a 100 liter tank. It is initially fi...

environ 2 ans ago

Solved

Number of Even Elements in Fibonacci Sequence
Find how many even Fibonacci numbers are available in the first d numbers. Consider the following first 14 numbers 1 1 2...

environ 2 ans ago

Solved

The 5th Root
Write a function to find the 5th root of a number. It sounds easy, but the typical functions are not allowed (see the test su...

environ 2 ans ago

Is it possible to convert symfun to sym?
Symfun is a subclass of sym, so, yes, a symfun is already a sym. To get only the body of the function, use |formula| or call ...

environ 2 ans ago | 3

How to Read PDF file in Matlab?
Just for the record, Text Analytics Toolbox (new in R2017b) includes a function |extractFileText| that will extract text data fr...

environ 2 ans ago | 1

Is there any video which shows the entire process of opinion mining on actual data?
In its simplest form, opinion mining can be viewed as a binary classification problem. There is an example at <https://www.mathw...

environ 2 ans ago | 0

| accepted

How can I remove websites' links from a text?
The <https://www.mathworks.com/help/textanalytics/ref/eraseurls.html eraseURLs> functions might help. Which does a little more w...

environ 2 ans ago | 0

Text Extraction and retrieval
It's probably easiest to split the text and then check the number of splits created to count, using string functions: str =...

environ 2 ans ago | 0

Basic question about Text Analysis/Text Analytics/Text Mining using Matlab
As a quick update, the new <https://www.mathworks.com/products/text-analytics.html Text Analytics Toolbox> debuted in R2017b.

plus de 2 ans ago | 0

How to link 2 3D subplots to sync zoom and pan?
As Adam suggested in the comments, this seems to work: ax1 = subplot(1, 2, 1); [x,y,z] = peaks; surf(x,y,z); ax2 =...

plus de 2 ans ago | 4

| accepted

Solved

Triangle sequence
A sequence of triangles is constructed in the following way: 1) the first triangle is Pythagoras' 3-4-5 triangle 2) the s...

plus de 2 ans ago

Solved

Find a Pythagorean triple
Given four different positive numbers, a, b, c and d, provided in increasing order: a < b < c < d, find if any three of them com...

plus de 2 ans ago

Solved

Find out sum of all elements of given Matrix
Find out sum of all elements of given Matrix A=[1 2 3;4 5 6 ;7 8 9]; Answer must be: 45 *If you like this problem, pl...

plus de 2 ans ago

Solved

Area of an equilateral triangle
Calculate the area of an equilateral triangle of side x. <<http://upload.wikimedia.org/wikipedia/commons/e/e0/Equilateral-tr...

plus de 2 ans ago