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Steven Niggebrugge


Shell Asset Management Company B.V.

Last seen: mer än 2 år ago |  Active since 2016

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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...

mer än 4 år ago | 0 answers | 0

0

answers

Question


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?...

nästan 5 år ago | 1 answer | 0

1

answer

Question


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. ...

nästan 5 år ago | 1 answer | 0

1

answer

Question


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...

ungefär 5 år ago | 0 answers | 0

0

answers

Question


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

ungefär 5 år ago | 0 answers | 0

0

answers

Question


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...

mer än 6 år ago | 1 answer | 0

1

answer

Question


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...

mer än 6 år ago | 2 answers | 0

2

answers

Question


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...

mer än 6 år ago | 0 answers | 0

0

answers

Question


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...

mer än 6 år ago | 1 answer | 0

1

answer

Question


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...

mer än 7 år ago | 2 answers | 0

2

answers

Question


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...

mer än 7 år ago | 1 answer | 0

1

answer

Solved


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...

mer än 7 år 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 ...

mer än 7 år 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...

mer än 7 år 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...

mer än 7 år 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...

mer än 7 år 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...

mer än 7 år 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...

mer än 7 år 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...

nästan 8 år 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 ...

nästan 8 år 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...

nästan 8 år ago

Solved


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

nästan 8 år 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...

nästan 8 år 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...

nästan 8 år 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...

nästan 8 år ago | 2 answers | 0

2

answers

Question


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...

nästan 8 år ago | 1 answer | 0

1

answer

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 ...

mer än 8 år 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:...

mer än 8 år 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']...

mer än 8 år ago | 4 answers | 0

4

answers