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How can i generate 3 random points within a 2x2m grid?
I think you were on the right lines but you need to subtract one from your x and y: x=rand(1,3)*2-1; y=rand(1,3)*2-1; That'll...

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Remove the polynomials that have positive real elements of their roots.
The characteristic equation for a dynamic system is a polynomial whose roots indicate its behavior. If any of the <http://www.ma...

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Renaming a field in a structure array
MATLAB has a <http://www.mathworks.com/help/techdoc/ref/setfield.html setfield> and a <http://www.mathworks.com/help/techdoc/ref...

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DNA N-Gram Distribution
Given a string s and a number n, find the most frequently occurring n-gram in the string, where the n-grams can begin at any poi...

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Pattern matching
Given a matrix, m-by-n, find all the rows that have the same "increase, decrease, or stay same" pattern going across the columns...

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It dseon't mettar waht oedrr the lrettes in a wrod are.
An internet meme from 2003 (read more <http://www.snopes.com/language/apocryph/cambridge.asp here>) asserted that readers are re...

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What is the next step in Conway's Life?
Given a matrix A that represents the state of <http://en.wikipedia.org/wiki/Conway's_Game_of_Life Conway's game of Life> at one ...

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Word Counting and Indexing
You are given a list of strings, each being a list of words divided by spaces. Break the strings into words, then return a maste...

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Find state names that end with the letter A
Given a list of US states, remove all the states that end with the letter A. Example: Input s1 = 'Alabama Montana Nebras...

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Is my wife right? Now with even more wrong husband
Again, as in "Is my wife right?" ( <http://www.mathworks.com/matlabcentral/cody/problems/149-is-my-wife-right> ), answer 'yes' r...

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Collapse contour plots on a single plot
If you just want them all on a single plot then just do: contour(x1,y1,z1) hold on contour(x2,y2,z2) and so on... If you wa...

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Unable to predict data well enough
I am far from an expert in this area but I'd guess that you are struggling to get a good preciction because you don't have enoug...

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Problem in drawing curves after solving ode equations
I think your issue comes from the y(:,2)-N_0 part of your r_R expression. This is asking to take a number away from a number...

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Find the palindrome
Given the string a, find the longest palindromic sub-string b. So when a = 'xkayakyy'; you should return b = 'kayak';

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Kaprekar Steps
6174 is the <http://en.wikipedia.org/wiki/6174_%28number%29 Kaprekar constant>. All natural numbers less than 10,000 (except som...

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Find state names that start with the letter N
Given a list of US states, remove all the states that start with the letter N. If s1 = 'Alabama Montana Nebraska Vermont Ne...

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Find the peak 3n+1 sequence value
A Collatz sequence is the sequence where, for a given number n, the next number in the sequence is either n/2 if the number is e...

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How to convrt parts of grayscale to RGB
This should do the trick: A = rgb2gray(imread('image.png')); A = cat(3, A, A, A); s=size(A); for i=1:s(1) for j=1:s(2) ...

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How can I get rid of neighbour data?
So I will preface this by saying there are probably more efficient ways but as you mentione using a for loop you could begin wit...

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how can i sum
You can make a simpler solution by just doing: A(A<0)=0; sum(A') If you want to retain the original A matrix then create a co...

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return many value in function.
You do have c5 in your function line. It currently says: function [c1,c2,c3,c5] = calc_centroid(data) Perhaps, just swapping t...

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hold on for double plots in one loop
You just need to move the figure command or you’ll get two new figure windows. This would be something like: figure for ...

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Creating a function that goes through a Matrix and scans for any values lesser than 0 (so -1 for example) ?
For a matrix A A(A<0)=0 will convert all negative values to zeros.

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Why array of strings are concatenated?
You could just store this in a cell array instead - with one parameter inside each cell

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Finding the last maximum value in a vector
I think this should do it for you: idx = max(find(A==max(max(A))))

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for loop within for loop
I don't know what you want to do inside those for loops so I can't give you full code but the loops you'll want are: for i=1:4;...

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Unwanted line connecting last point of current plot to the starting one of the next plot
a = [100e6,120e6,130e6]; %semi major axes of different orbits e = [0.7,0.8,0.9]; %eccentricity of different orbits dtheta = [9...

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how to duplicate the values in one matrix create another matrix of specific dimension
Assuming you want the rest of the larger matrix to be zeros, then you could use: s=size(A); B(1:s(1),1:s(2)) = A; This will s...

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Acquire data from a cartesian diagram in pdf format
I don't think there is an automatic way to do this, but you could use GRABIT from the File Exchange which will allow you to grab...

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Zero a cell matrix with varying number of zeros
I'm not 100% sure I follow, but as I understand you want to take some list of columns and turn all elements in that column to ze...

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