Thinking of starting school, leaving home, crying all night, I miss my mother!
（1）Problem 30. Sort a list of complex numbers based on far they are from the origin.
Given a list of complex numbers z, return a list zSorted such that the numbers that are farthest from the origin (0+0i) appear first.
So if z is
z = [-4 6 3+4i 1+i 0]
then the output zSorted would be
zSorted = [6 3+4i -4 1+i 0]
What I thought about this question at first was to find z abs first, so that we can get the relative distance of each number from the origin, and then sort these distances to get the serial number values arranged by size, and then bring these serial number values into Original array, get the final result. Not only is the process complicated, but it is also error-prone. In fact, you can directly use the row size function "sort" to sort the array from small to large. If you want to sort from large to small, you need sort(z,'descend').
answer:
function zSorted = complexSort(z)
zSorted = sort(z, 'descend');
（2）Problem 247. Arrange Vector in descending order
If x=[0,3,4,2,1] then y=[4,3,2,1,0]
This problem is similar to the above, even simpler and better to understand, and can also be solved with the sort function.
answer:
function y = desSort(x)
y = sort(x, 'descend');
（3）Roll the Dice!
Description
Return two random integers between 1 and 6, inclusive, to simulate rolling 2 dice.
Example
[x1,x2] = rollDice();
x1 = 5;
x2 = 2;
The rand function was used at the beginning, but an error was reported, and then I found that the randi function was used:
The randi() function generates uniformly distributed pseudo-random integers in the range of imin--imax. If imin is not specified, the default is 1.
r = randi(imax,n): generate n*n matrix
r = randi(imax,m,n): generate m*n matrix
r = randi(imax,[m,n]): Same as above
r = randi(imax,m,n,p,...): Generate a matrix of m*n*p*...
r = randi(imax,[m,n,p,...]) Same as above
r = randi(imax): 1*1 matrix
r = randi(imax,size(A)): a matrix with the same dimension as size(A)
r = randi ([imin, imax], ...)
answer:
function [x1,x2] = rollDice()
x1 = rand (6.1);
x2 = randi (6,1);