There are, here at Cody, a lot of people who can code very well on Matlab. But I find that every one who publish a problem should have the humility to wait for many solvers before he/she put his/her own solution. But that's only my personal opinion. ;-)
You can't see my solution until u make working one with the same size, so I think it doesn't matter.
Doubling elements in a vector
Try 1.5.4: Celsius to Fahrenheit
Tiling a matrix
Check if equal
Matlab Basics - Pick out parts of a vector
Mean and standard deviation of times in string
Volume and area of a sphere
Number of odd and even elements within matrix
Make a vector of prime numbers
Create matrix with Gray code
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