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Odd elimination

Inspired by Project Euler problem #539 You'll be given a vector from 1 to n; Going from left to right, remove the first n...

7 months ago

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Pseudo Square Root (Inspired by Project Euler 266)

Shamelessly copied from the Project Euler page for Problem 266: ------------- The divisors of 12 are: 1,2,3,4,6 and 12. T...

7 months ago

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There are 10 types of people in the world

Those who know binary, and those who don't. The number 2015 is a palindrome in binary (11111011111 to be exact) Given a year...

10 months ago

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Some Assembly Required

The input to this function is a matrix of real numbers. Your job is to assemble the rows of the matrix into one large row that ...

12 months ago

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Day counter function

Write a function called _day_counter_ that returns the number of Mondays that fell on the first day of the month in a given year...

12 months ago

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Matlab Basics - y as a function of x

Write a function to calculate y as a function of x, such that y = 6x^2 + 5x - 2

12 months ago

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Back to basics 9 - Indexed References

Covering some basic topics I haven't seen elsewhere on Cody. Given an input matrix and row and column, output the index of th...

12 months ago

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Calculate the square of a number (Super Easy)

The goal is to calculate the square (y) of a number (x). Good way to start MatLab for beginners.

12 months ago

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Is it a number?

Determine if input is numeric. If it is,output is 1; if it is not, output is 0.

12 months ago

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The Piggy Bank Problem

Given a cylindrical piggy bank with radius g and height y, return the bank's volume. [ g is first input argument.] Bonus though...

1 year ago

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Finding sum of even numbers in a vector.

Find the sum of all the even numbers present in the input vector x. Examples: Input x = [1 2 3 4] Output y is 6 Input...

2 years ago

Answered

Issues with findpeaks()

I must stress that I am not sure and I don't have acces to the Signal Processing Toolbox to check. However, have you tried rever...

Issues with findpeaks()

I must stress that I am not sure and I don't have acces to the Signal Processing Toolbox to check. However, have you tried rever...

2 years ago | 1

| accepted

Answered

hide legend for certain curves in a Matlab plot

If you aren't fussed about actually doing this within the code then you can select the lines, open up the property editor, find ...

hide legend for certain curves in a Matlab plot

If you aren't fussed about actually doing this within the code then you can select the lines, open up the property editor, find ...

2 years ago | 7

| accepted

Answered

Loop and write into a cell

This part of your code: for k=1:10 c{k}=sum(p(1:,k) 1)) end has two open (left) brackets and three close (right) b...

Loop and write into a cell

This part of your code: for k=1:10 c{k}=sum(p(1:,k) 1)) end has two open (left) brackets and three close (right) b...

2 years ago | 0

Answered

Need to solve a nonlinear ODE using matlab

There are a range of ODE solvers available in MATLAB that could do this. The following link can help you pick which one is most ...

Need to solve a nonlinear ODE using matlab

There are a range of ODE solvers available in MATLAB that could do this. The following link can help you pick which one is most ...

2 years ago | 0

Answered

HELP! My for loop code won't produce a line on the graph I plot

I'm not 100% sure but I'd guess you want the last line to be: semilogx(A,F) because otherwise everything is plotting at the sa...

HELP! My for loop code won't produce a line on the graph I plot

I'm not 100% sure but I'd guess you want the last line to be: semilogx(A,F) because otherwise everything is plotting at the sa...

2 years ago | 0

Answered

How to write this matlab code?

Assuming you want the mean of the whole matrix (not mean by row/column or something else) then the first line will be: A = (B -...

How to write this matlab code?

Assuming you want the mean of the whole matrix (not mean by row/column or something else) then the first line will be: A = (B -...

2 years ago | 0

Answered

Jumping over several loops

There are a few ways of doing this. They have largely been covered in the below links: https://uk.mathworks.com/matlabcentral/a...

Jumping over several loops

There are a few ways of doing this. They have largely been covered in the below links: https://uk.mathworks.com/matlabcentral/a...

3 years ago | 0

Answered

Smooth bad data in MattLab

I think you could easily do this by using find to locate the indices of all values lying in the shifted range. This would be som...

Smooth bad data in MattLab

I think you could easily do this by using find to locate the indices of all values lying in the shifted range. This would be som...

3 years ago | 0

| accepted

Answered

How to select certain columns of a matrix only when the values in the 4th row are bigger than three values of the other four rows in that particular column?

For the example in your question, the following will work: [~,c] = size(A); a = ones(1,c); for col = 1:c if((sum(abs(A(4...

How to select certain columns of a matrix only when the values in the 4th row are bigger than three values of the other four rows in that particular column?

For the example in your question, the following will work: [~,c] = size(A); a = ones(1,c); for col = 1:c if((sum(abs(A(4...

3 years ago | 1

| accepted

Answered

Finding indices of first maximum value and last minimum value of a square wave

You could use f = find ( y > threshold ) to find the indices corresponding to all values that exceed some threshold value. The...

Finding indices of first maximum value and last minimum value of a square wave

You could use f = find ( y > threshold ) to find the indices corresponding to all values that exceed some threshold value. The...

3 years ago | 0

Solved

Special matrix

Make a square matrix with this shape. For n=4 M = 1 1 0 0 1 0 1 0 0 1 0 ...

3 years ago

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Make a Star Pyramid

Create a star pyramid. First line will have 1 star, second will have two stars and so on... a basic program which is easily done...

3 years ago

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"mirror" matrix

Create n x 2n "mirror" matrix of this type: Examples For n = 2 m = [ 1 2 2 1 1 2 2 1 ] For n = 3 m = ...

3 years ago

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Better bullseye matrix

<http://www.mathworks.com/matlabcentral/cody/problems/18-bullseye-matrix Problem 18> asks to create a bullseye matrix like this:...

3 years ago

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Height of a right-angled triangle

Given numbers a, b and c, find the height of the right angled triangle with sides a and b and hypotenuse c, for the base c. If a...

3 years ago

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Right Triangle Side Lengths (Inspired by Project Euler Problem 39)

If _p_ is the perimeter of a right angle triangle with integral length sides, { _a_, _b_, _c_ }, there are exactly three solutio...

3 years ago

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Find the sides of an isosceles triangle when given its area and height from its base to apex

Find the sides of an isosceles triangle when given its area and the height from its base to apex. For example, with A=12 and ...

3 years ago