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# ME

##### Last seen: 1 day ago
599 total contributions since 2016

Working in mathematical biology.

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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 ...

18 days ago | 0

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...

18 days ago | 0

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 -...

19 days ago | 0

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...

1 month ago | 0

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...

1 month ago | 0

| accepted

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...

1 month ago | 1

| accepted

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...

1 month 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 ...

2 months ago

Solved

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...

2 months ago

Solved

"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 = ...

2 months ago

Solved

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

2 months ago

Solved

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...

2 months ago

Solved

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...

2 months ago

Solved

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 ...

2 months ago

Solved

Can we make a triangle?
Given three positive number, check whether a triangle can be made with these sides length or not. remember that in a triangle su...

2 months ago

Solved

Is the Point in a Triangle?
Check whether a point or multiple points is/are in a triangle with three corners Points = [x, y]; Triangle = [x1, y1; x...

2 months ago

Solved

Calculate the centroid of a triangle
Info: https://en.wikipedia.org/wiki/Centroid Example Input: x = [0 0 1]; % x-coordinate y = [0 1 0]; % y-coordinat...

2 months ago

Solved

Calculate the area of a triangle between three points
Calculate the area of a triangle between three points: P1(X1,Y1) P2(X2,Y2) P3(X3,Y3) these three points are the vert...

2 months ago

Solved

Find my daddy long leg (No 's')
Given the ratio of the two legs (longer / shorter), and the hypotenuse length, find the value of the bigger leg.

2 months ago

Solved

Convert matrix to 3D array of triangular matrices
Given a 2D numeric array x in which each column represents the vectorized form of an upper triangular matrix, return a 3D array ...

2 months ago

Solved

MatCAT - Reconstruct X from Its X-rays
Consider a matrix x x = [ 1 2 0 0 5 0 3 0 8 ] If we sum x along the rows we get row_sums = [3 5 11] ...

2 months ago

Solved

The sliding puzzle: 15
If you are unfamiliar with the sliding puzzle, enter the command _fifteen_ in your MATLAB command window (or search online, of c...

2 months ago

Solved

Free passes for everyone!
_Simply return the name of the coolest numerical computation software ever_ *Extra reward* (get a _freepass_): Once a mont...

2 months ago

Hi, I have set of values for x (x = 1:10) and I have a equation y = x^(1/2)/x, how can i get and display an array of values of y from the x's ?
I don't know how you've got one number but I think you should be using: x = 1:10 y = x.^(1/2)./x

2 months ago | 0

how can i save variables in a for loop?
If your issue is how to get the file names then you can use: save( strcat( 'DesignResults_', num2str(n) ); within your loop an...

2 months ago | 0

Solved

Hankelize a matrix
Similar to <http://www.mathworks.com/matlabcentral/cody/problems/42501-toeplitize-a-matrix Problem 42501. Toeplitize a matrix>, ...

2 months ago

Solved

Toeplitize a matrix
Similar to <http://www.mathworks.com/matlabcentral/cody/problems/3094-hankelize-a-matrix Problem 3094. Hankelize a matrix>, now ...

2 months ago

Solved

Matrix of Multiplication Facts
This is James's daughter again, sneaking into his Cody account. Thanks to your help in my math class last year, I did great! B...

2 months ago

Solved

Remove entire row and column in the matrix containing the input values
Remove the entire row and column from the matrix containing specific values. The specified value can be a scalar or a vector. Fo...

2 months ago

Solved

Matrix multiplication across rows
Given matrix m, return matrix n such that, rows of n are result of multiplication of the rows of the input matrix Example ...

2 months ago