A résolu


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 ...

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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...

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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...

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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...

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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?

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Sum of series VIII

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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)

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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.

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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.

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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...

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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...

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Make a Plot with Functions
Make a plot and test

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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. ...

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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 ...

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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 ...

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A résolu


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

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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 ...

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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...

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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...

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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...

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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...

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A résolu


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...

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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？

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1

réponse

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...

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réponse

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...

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1

réponse

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 ...

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Question


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

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2

réponses

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...

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1

réponse

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?

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1

réponse

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 ...

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