# Steven Niggebrugge

### Shell Asset Management Company B.V.

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**Content Feed**

Question

Building random forest with cross-validation

Hi, i have been wondering for some time now how random forests (Bagging, or AdaBoost, doesn't matter) are built when using cros...

1 year ago | 0 answers | 0

### 0

answersQuestion

Convert categorical back to integer

Hi, i convert an integer to a categorical a=[-1 0 1] b=categorical(a) now how do i convert b back to the same integers in a?...

2 years ago | 1 answer | 0

### 1

answerQuestion

Create cell array of numbers

Hi, how can i create a function that creates a cell array of number array 1:n, so the result is a cell array of string values. ...

2 years ago | 1 answer | 0

### 1

answerQuestion

Classification tree view function - predictor categories are replaced by numbers?

Hello, I created a classification ensemble tree using categorical predictors (typically 4 or 5 classes/labels for each predicto...

2 years ago | 0 answers | 0

### 0

answersQuestion

predictorImportance for classification trees

Hello, would the predictorImportance() function also work for classification trees (random forest, AdaBoostM1 or Bag method)? ...

2 years ago | 0 answers | 0

### 0

answersQuestion

Solve multivariate equation using fsolve()

Hi, i have written a multivariate function f(x, a, b, c). Holding a, b, c values fixed, i want to know for what value of x the...

3 years ago | 1 answer | 0

### 1

answerQuestion

Replace values in each column by 0 after a pre-specified search value was found in that column

Hello, i have a matrix A, for example A = [1, 1; 0.5, 1; 0.5, 0.5; 1, 1] I want to insert 0 values in each column, but only if...

3 years ago | 2 answers | 0

### 2

answersQuestion

CreditDefaultCopula function not in my Matlab 2016a version, how to get it?

Hello, i would like to use Matlab's 2018 CreditDefaultCopula function to model defaults. How can i get this function in my Mat...

3 years ago | 0 answers | 0

### 0

answersQuestion

Replace values in matrix by first non-zero value in previous row

Hi, how can i replace zero values in a matrix by the first occurring non-zero value in that matrix if you would loop backwards...

4 years ago | 1 answer | 0

### 1

answerQuestion

How to calculate maximum up to current point?

Hi, how can i calculate the an array of current maxima, i.e. for each point in the array to calculate the maximum from the first...

4 years ago | 2 answers | 0

### 2

answersQuestion

100 Random numbers given t-distribution with mu = x% std = y% and df = 100?

How can i create a 100 x 2 array with random numbers, given the following distribution: -mu = 2% -sigma = 3% -df = 100 tha...

4 years ago | 1 answer | 0

### 1

answerSolved

Enlarge array

Given an mxn numeric array (A) and a 1x2 vector (sz) indicating the dimensions [p q] to enlarge each element, return an (m*p)x(n...

4 years ago

Solved

Flip the main diagonal of a matrix

Given a n x n matrix, M, flip its main diagonal. Example: >> M=magic(5); >> flipDiagonal(M) 9 24 1 ...

4 years ago

Solved

Return the first and last character of a string

Return the first and last character of a string, concatenated together. If there is only one character in the string, the functi...

4 years ago

Solved

Replace May with April

For instance, if the input is input_str = 'The flowers may bloom in April'; then the output is output_str = 'The flo...

5 years ago

Solved

Which values occur exactly three times?

Return a list of all values (sorted smallest to largest) that appear exactly three times in the input vector x. So if x = [1 2...

5 years ago

Solved

Simple equation: Annual salary

Given an hourly wage, compute an annual salary by multiplying the wage times 40 and times 50, because salary = wage x 40 hours/w...

5 years ago

Solved

Sort a list of complex numbers based on far they are from the origin.

Given a list of complex numbers z, return a list zSorted such that the numbers that are farthest from the origin (0+0i) appear f...

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

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

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

Determine if input is odd

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

5 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...

5 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...

5 years ago

Question

Surfl chart; datetime on y-axis, letters on x-axis

Hi, i am trying to make a 3d surface chart (surfl) out of a x-by-y table named 'cum_pl', which contains daily P&L numbers for x...

5 years ago | 2 answers | 0

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answersQuestion

Formula for calculating marginal risk contributions (video MATLAB for Advanced Portfolio Construction and Stock Selection Models)

Hi, i just watched the video https://nl.mathworks.com/videos/matlab-for-advanced-portfolio-construction-and-stock-selection-mod...

5 years ago | 1 answer | 0

### 1

answerSolved

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 ...

5 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:...

5 years ago

Question

How can i generate month and year strings for Datetime vectors?

How can i generate month and year concatenated strings for Datetime vectors? E.g. i have vector ['01/Jan/2015';'01/Feb/2015']...

5 years ago | 4 answers | 0