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Back to basics 22 - Rotate a matrix

Covering some basic topics I haven't seen elsewhere on Cody. Rotate the input matrix 90 degrees counterclockwise (e.g. [1 2; ...

8 years ago

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Duplicate each element of a vector.

for an n-dimensional vector x, the function should return another vector 2n-dimension which each element is repeated twice. Ex...

8 years ago

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non-linear optimization over a frequency bandwidth

I think you can do exactly what you said: maximize the average voltage output. Use fmincon, but write an objective function t...

non-linear optimization over a frequency bandwidth

I think you can do exactly what you said: maximize the average voltage output. Use fmincon, but write an objective function t...

8 years ago | 0

Answered

Is numeric gradient estimation well-posed

It will depend a great deal on the characteristics of your function. If your function is smooth, then you can generally expect g...

Is numeric gradient estimation well-posed

It will depend a great deal on the characteristics of your function. If your function is smooth, then you can generally expect g...

8 years ago | 0

Answered

How can I set transparency in 2D plot?

I don't think there's a way to make markers transparent. However, you could plot each data point as a small circle (using patch)...

How can I set transparency in 2D plot?

I don't think there's a way to make markers transparent. However, you could plot each data point as a small circle (using patch)...

8 years ago | 2

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Magic!

Check whether the input matrix is a normal magic square: <http://en.wikipedia.org/wiki/Magic_square> Output the logical va...

8 years ago

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Count photos

Given n people, everyone must have pictures taken with everyone, each photo includes only two persons, please count the total nu...

8 years ago

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Who knows the last digit of pi?

There is only one man who knows the last digit of pi, who is that man? Give the name of that man, who, by popular believe, can ...

8 years ago

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Return elements unique to either input

Given two numeric inputs a and b, return a row vector that contains the numbers found in only a or only b, but not both. For ex...

8 years ago

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Set the array elements whose value is 13 to 0

Input A either an array or a vector (which can be empty) Output B will be the same size as A . All elements of A equal to 13...

8 years ago

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Create a square matrix of multiples

Given an input, N, output a matrix N x N with each row containing multiples of the first element of each row. This also applies...

8 years ago

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Whether the input is vector?

Given the input x, return 1 if x is vector or else 0.

8 years ago

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Generate a vector like 1,2,2,3,3,3,4,4,4,4

Generate a vector like 1,2,2,3,3,3,4,4,4,4 So if n = 3, then return [1 2 2 3 3 3] And if n = 5, then return [1 2 2...

8 years ago

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Make a 1 hot vector

Make a vector of length _N_ that consists of all zeros except at index _k_, where it has the value 1. Example: Input ...

8 years ago

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Back to basics 1 - Saving

Covering some basic topics I haven't seen elsewhere on Cody. Given an input variable 'x', save it to disk in a file named 'co...

8 years ago

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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....

8 years ago

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Rotate a Matrix by 90 degrees

Rotate a Matrix by 90 degrees Example: If the input is: X = 1 2 3 4 5 6 7 8 9 ...

8 years ago

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Compute a dot product of two vectors x and y

x and y are input vectors, d is a number and contains their dot product

8 years ago

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Back to basics 12 - Input Arguments

Covering some basic topics I haven't seen elsewhere on Cody. Return a value equal to the number of input arguments to the fun...

8 years ago

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Get the length of a given vector

Given a vector x, the output y should equal the length of x.

8 years ago

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Back to basics 14 - Keywords

Covering some basic topics I haven't seen elsewhere on Cody. Return a cell array of all MATLAB keywords

8 years ago

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Determine Whether an array is empty

Input a matrix x, output y is TRUE if x is empty, otherwise FALSE.

8 years ago

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Project Euler: Problem 10, Sum of Primes

The sum of the primes below 10 is 2 + 3 + 5 + 7 = 17. Find the sum of all the primes below the input, N. Thank you <http:/...

8 years ago

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Back to basics 11 - Max Integer

Covering some basic topics I haven't seen elsewhere on Cody. Return the largest positive integer MATLAB can handle.

8 years ago

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Check if number exists in vector

Return 1 if number _a_ exists in vector _b_ otherwise return 0. a = 3; b = [1,2,4]; Returns 0. a = 3; b = [1,...

8 years ago

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Vectorize the digits of an Integer

Create a vector of length N for an integer of N digits. x=123045; x_vec=[1 2 3 0 4 5]; I happened upon a trick to do ...

8 years ago

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Multielement indexing of a row array

The row array birthRateChina stores the China birth rate (per 1000 people) for years 2000 to 2012. Write a statement that create...

8 years ago