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# Steven Niggebrugge

### Shell Asset Management Company B.V.

Last seen: 대략 1년 전 2016년부터 활동

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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...

대략 3년 전 | 답변 수: 0 | 0

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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?...

거의 4년 전 | 답변 수: 1 | 0

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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. ...

거의 4년 전 | 답변 수: 1 | 0

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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...

거의 4년 전 | 답변 수: 0 | 0

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

대략 4년 전 | 답변 수: 0 | 0

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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...

5년 초과 전 | 답변 수: 1 | 0

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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...

5년 초과 전 | 답변 수: 2 | 0

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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...

5년 초과 전 | 답변 수: 0 | 0

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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...

5년 초과 전 | 답변 수: 1 | 0

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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...

대략 6년 전 | 답변 수: 2 | 0

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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...

대략 6년 전 | 답변 수: 1 | 0

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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...

6년 초과 전

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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 ...

6년 초과 전

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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...

6년 초과 전

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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...

6년 초과 전

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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...

6년 초과 전

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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...

6년 초과 전

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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...

6년 초과 전

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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...

6년 초과 전

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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 ...

6년 초과 전

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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...

6년 초과 전

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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.

6년 초과 전

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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...

6년 초과 전

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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...

6년 초과 전

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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...

6년 초과 전 | 답변 수: 2 | 0

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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...

6년 초과 전 | 답변 수: 1 | 0

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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 ...

대략 7년 전

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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:...

대략 7년 전

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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']...

7년 초과 전 | 답변 수: 4 | 0

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