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Steven Niggebrugge


Shell Asset Management Company B.V.

Last seen: más de 1 año hace |  Con actividad desde 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...

más de 3 años hace | 0 respuestas | 0

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respuestas

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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?...

más de 4 años hace | 1 respuesta | 0

1

respuesta

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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. ...

más de 4 años hace | 1 respuesta | 0

1

respuesta

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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...

más de 4 años hace | 0 respuestas | 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)? ...

más de 4 años hace | 0 respuestas | 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...

casi 6 años hace | 1 respuesta | 0

1

respuesta

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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...

casi 6 años hace | 2 respuestas | 0

2

respuestas

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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...

casi 6 años hace | 0 respuestas | 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...

alrededor de 6 años hace | 1 respuesta | 0

1

respuesta

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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...

más de 6 años hace | 2 respuestas | 0

2

respuestas

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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...

más de 6 años hace | 1 respuesta | 0

1

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Resuelto


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...

casi 7 años hace

Resuelto


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 ...

casi 7 años hace

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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...

casi 7 años hace

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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...

alrededor de 7 años hace

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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...

alrededor de 7 años hace

Resuelto


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...

alrededor de 7 años hace

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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...

alrededor de 7 años hace

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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...

alrededor de 7 años hace

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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 ...

alrededor de 7 años hace

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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...

alrededor de 7 años hace

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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.

alrededor de 7 años hace

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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...

alrededor de 7 años hace

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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...

alrededor de 7 años hace

Pregunta


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...

alrededor de 7 años hace | 2 respuestas | 0

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respuestas

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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...

alrededor de 7 años hace | 1 respuesta | 0

1

respuesta

Resuelto


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 ...

más de 7 años hace

Resuelto


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:...

más de 7 años hace

Pregunta


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']...

casi 8 años hace | 4 respuestas | 0

4

respuestas