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Extract Built In Functions and Toolbox Functions from String or Function Handle

Find the Built-In functions and Toolbox functions in either a string or a function handle. Generate a string of alphabetized ...

1 year ago

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Function Sniffer

Given a string, find out which built-in functions are present, output a simple string, that has sorted and unique list of the...

1 year ago

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Symmetry of vector

Determine whether the vector is symmetric or not (vector could be even or odd in length). For example: x = [1 2 3 3 2 1] is s...

1 year ago

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Sum of big primes without primes

Inspired by Project Euler n°10 (I am quite obviously a fan). With problem n°250 by Doug, you can find some global methods to co...

1 year ago

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Sum of series IX

What is the sum of the following sequence: Σ 1/k! for k=1...n for different n?

1 year ago

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Sum of series

a(n) = n^2 - (n-1)^2 find the summation of the series upto n i.e. a(1)+a(2)+...+a(n)

1 year ago

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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.

1 year ago

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Magic is simple (for beginners)

Determine for a magic square of order n, the magic sum m. For example m=15 for a magic square of order 3.

1 year ago

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Find Logic 14

Guess the Logic! logic(1) = 100 logic(2) = 96 logic(3) = 105 logic(4) = 89 logic(5) = 114 Make a function logic(x) which w...

1 year ago

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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...

1 year ago

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Plotting Practice

Plot cos(x) vs x as shown in the figure below. Include the appropriate title, x-label, and y-label. Note, it is case sensitive. ...

2 years ago

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Dog Statistics

The vectors ht and wt contains the heights and weights of 20 golden retrievers. In some cases, it was not possible to make both ...

2 years ago

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Determine if x is a combination of m and n

Given positive integers x, m, and n, determine if x can be written as x = am + bn for any (non-negative) integers a and b. Your ...

2 years ago

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Create an arrow matrix

An arrow matrix is a square matrix that contains ones on the diagonal, the last column, and last row. ...

2 years ago

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Calculating Student Grades

The matrix grades contains raw grades for 7 students who took your course. Each row represents a different student. The first 7 ...

2 years ago

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Simpson's Paradox - Calculate correlation coefficients for groups of data

Simpson's Paradox is a statistical phenomenon where groups of data can have a characteristic while the whole data set together h...

2 years ago

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Find the minimum of the column-maximums of a matrix

Given a matrix A, find the maximum value of each column, then return the smallest of those maximum values (ie return the minimum...

2 years ago

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Calculate the mean of each half of a matrix

Given a matrix with an even number of columns, n, return a 1-by-2 row vector where the first element is the mean of all the elem...

2 years ago

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Find Closest Constant

Given a number x, return the value that is closest to x from this list of constants: 0, 1, , e, , (also known as ). For exampl...

2 years ago

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Matrix Quadrants

Write a function that takes N as the input, and outputs a matrix whose upper-left (NxN) quadrant contains all ones, the lower-ri...

2 years ago

Question

Limit angle in [-90, 90] degree

Aｓ Ｉ ｗａｓ ｕｓｉｎｇ ｏｄｅ４５ ｔｏ ｓｏｌｖｅ ＯＤＥｓ， Ｉ ｄｏ ｎｏｔ ｋｎｏｗ ｔｏ ｌｉｍｉｔ ｔｈｅ ｒｅｓｕｌｔ ｉｎ ［－９０，９０］ ｄｅｇｒｅｅ． Ａｎｙｏｎｅ ｍａｙ ｐｒｏｖｉｄｅ ｓｏｍｅ ｈｅｌｐ？

2 years ago | 1 answer | 0

Question

label is not at the center of axes

when I was plotting a 3D line, I tried to use xlabel/ylabel to make a axis label. However, I found these labels are not at the c...

2 years ago | 1 answer | 0

Question

how can I change lighting using codes?

Now, I plot a figure, however, it is dark. And I use the button to change the lighting, I am wondering whether there exists a me...

2 years ago | 1 answer | 0

Question

How to define a colormap easily

I tried to define a colormap, however it is rather difficult, because I have to choose a value and then I see what the color it ...

2 years ago | 2 answers | 0

Question

what is the time complexity of function 'reshape'

anyone knows what is the time complexity of function 'reshape'?

2 years ago | 2 answers | 0

Question

why use limit function goes wrong

syms x f=(2/pi*atan(x))^x; limit(f,x,inf,'right') Prompt：Inconsistent limit direction. however，I tried to transform the f...

2 years ago | 1 answer | 0

Question

How to adjust the brightness of an image in YCbCr color space

anyone know how to adjust the brightness of an image in YCbCr color space?

2 years ago | 1 answer | 0

Question

Why two methods give different results, and which is correct?

I use ode15i and ode45 to solve an implicit function, however two methods give different results, which is correct? clear clc ...

2 years ago | 1 answer | 0