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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...

9 months ago | 3

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

9 months ago | 1

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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...

10 months 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...

10 months 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...

10 months 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...

10 months ago | 0

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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...

10 months ago | 0

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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...

10 months 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...

10 months 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...

10 months ago | 1

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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...

1 year ago | 0

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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 ...

1 year 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...

2 years ago | 0

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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...

2 years 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 ...

2 years ago

Solved

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

2 years 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...

2 years 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...

2 years 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...

2 years 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 ...

2 years ago | 2

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...

2 years ago | 0

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...

2 years ago | 0

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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...

2 years 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 =...

2 years 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.

2 years 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 =...

2 years 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...

2 years 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...

2 years 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...

2 years 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...

2 years ago