# Christian

Last seen: plus de 2 ans il y a Actif depuis 2012

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Read parquet file error
Hi, I'm reading parquet files and facing some problems. For comparison the file was read with python using fastparquet with no ...

presque 3 ans il y a | 1 réponse | 0

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réponse

Question

Insert timestamp with timezone in database
Hi, I'd like to insert (table) data into an Oracle database. The data contains datetime variables with timezone information whi...

presque 3 ans il y a | 1 réponse | 0

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Question

Is there a way to create a custom cvpartition?
Hi, I'd like you use crossvalidation in a model with a custom set of training/test sample vectors. To use some of the built-...

environ 3 ans il y a | 2 réponses | 0

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A résolu

Given a and b, return the sum a+b in c.

environ 5 ans il y a

A résolu

How to find the position of an element in a vector without using the find function
Write a function posX=findPosition(x,y) where x is a vector and y is the number that you are searching for. Examples: fin...

plus de 10 ans il y a

A résolu

Reverse the vector
Reverse the vector elements. Example: Input x = [1,2,3,4,5,6,7,8,9] Output y = [9,8,7,6,5,4,3,2,1]

plus de 10 ans il y a

A résolu

New Cody Time-Out Time
Determine the New Cody Time-Out Time Consume the Maximum Possible Time without Timing out. *Score:* 60 (sec) - Time (sec) ...

plus de 10 ans il y a

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Check if sorted
Check if sorted. Example: Input x = [1 2 0] Output y is 0

plus de 10 ans il y a

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Most nonzero elements in row
Given the matrix a, return the index r of the row with the most nonzero elements. Assume there will always be exactly one row th...

plus de 10 ans il y a

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Find the numeric mean of the prime numbers in a matrix.
There will always be at least one prime in the matrix. Example: Input in = [ 8 3 5 9 ] Output out is 4...

plus de 10 ans il y a

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Finding Perfect Squares
Given a vector of numbers, return true if one of the numbers is a square of one of the other numbers. Otherwise return false. E...

plus de 10 ans il y a

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Weighted average
Given two lists of numbers, determine the weighted average. Example [1 2 3] and [10 15 20] should result in 33.333...

plus de 10 ans il y a

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Fibonacci sequence
Calculate the nth Fibonacci number. Given n, return f where f = fib(n) and f(1) = 1, f(2) = 1, f(3) = 2, ... Examples: Inpu...

plus de 10 ans il y a

A résolu

Right and wrong
Given a vector of lengths [a b c], determines whether a triangle with those sides lengths is a right triangle: <http://en.wikipe...

plus de 10 ans il y a

A résolu

Pizza!
Given a circular pizza with radius _z_ and thickness _a_, return the pizza's volume. [ _z_ is first input argument.] Non-scor...

plus de 10 ans il y a

A résolu

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...

plus de 10 ans il y a

A résolu

Make a checkerboard matrix
Given an integer n, make an n-by-n matrix made up of alternating ones and zeros as shown below. The a(1,1) should be 1. Example...

plus de 10 ans il y a

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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 ...

plus de 10 ans il y a

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Column Removal
Remove the nth column from input matrix A and return the resulting matrix in output B. So if A = [1 2 3; 4 5 6]; and ...

plus de 10 ans il y a

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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...

presque 12 ans il y a

A résolu

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

presque 12 ans il y a

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Nearest Numbers
Given a row vector of numbers, find the indices of the two nearest numbers. Examples: [index1 index2] = nearestNumbers([2 5 3...

presque 12 ans il y a

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Unique - Very Very Large Numbers
Given a vector column, with some very large numbers, create the ascending sort and unique vector. *Input:* A (column vector)...

presque 12 ans il y a

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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:...

presque 12 ans il y a

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Swap the input arguments
Write a two-input, two-output function that swaps its two input arguments. For example: [q,r] = swap(5,10) returns q = ...

presque 12 ans il y a

A soumis

csvexport
Export cellarrays to csv files

presque 12 ans il y a | 1 téléchargement |

A résolu

Getting the indices from a vector
This is a basic MATLAB operation. It is for instructional purposes. --- You may already know how to <http://www.mathworks....

presque 12 ans il y a

A résolu

surface of a spherical planet
you just discovered its circumference, that is the input.

presque 12 ans il y a

A résolu

Who Has the Most Change?
You have a matrix for which each row is a person and the columns represent the number of quarters, nickels, dimes, and pennies t...

presque 12 ans il y a

A résolu

Distance walked 1D
Suppose you go from position 7 to 10 to 6 to 4. Then you have walked 9 units of distance, since 7 to 10 is 3 units, 10 to 6 is 4...

presque 12 ans il y a