Code breaker, Part I: Operation Phoenix
You have been tasked with decoding a set of coded messages that have been intercepted.
Based on previous intelligence that ...
6年以上 前
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Getting logical indexes
This is a basic MATLAB operation. It is for instructional purposes.
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Logical indexing works like this.
thresh = 4...
6年以上 前
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Replicate elements in vectors
Replicate each element of a row vector (with NaN) a constant number of times.
Examples
n=2, A=[1 2 3] -> [1 1 2 2 3 3]
...
6年以上 前
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How to subtract?
*± ± ± ± ± ± ± ± ± ± ±*
* Imagine you need to subtract one...
6年以上 前
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Find the two most distant points
Given a collection of points, return the indices of the rows that contain the two points most distant from one another. The inpu...
6年以上 前
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Leap years on other planets
A year is a leap year if it is divisible by 4, but not if it is divisible by 100, unless it is also divisible by 400. This mean...
6年以上 前
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The 5th Root
Write a function to find the 5th root of a number.
It sounds easy, but the typical functions are not allowed (see the test su...
Sum all integers from 1 to 2^n
Given the number x, y must be the summation of all integers from 1 to 2^x.
For instance if x=2 then y must be 1+2+3+4=10.
7年弱 前
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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,...
7年弱 前
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Seemingly impossible problem
This is a _seemingly_ 'impossible' problem, because variously your function, "impossibleFn", must return an output of either 1 o...
7年弱 前
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Find a Pythagorean triple
Given four different positive numbers, a, b, c and d, provided in increasing order: a < b < c < d, find if any three of them com...
7年弱 前
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Choose the best fitting dominoes
You will be given a cell array of nx2 matrices. Choose one row from each matrix. These are the ordered pairs that will be plac...
7年弱 前
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Triangle Numbers
Triangle numbers are the sums of successive integers. So 6 is a triangle number because
6 = 1 + 2 + 3
which can be displa...
7年弱 前
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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 ...
Connect blocks in a model
Connect the blocks in the model to produce the following signal:
<<http://blogs.mathworks.com/images/seth/cody/connect-blocks...
約7年 前
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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...
7年以上 前
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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...
Pizza!
Given a circular pizza with radius _z_ and thickness _a_, return the pizza's volume. [ _z_ is first input argument.]
Non-scor...
8年弱 前
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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...