print 2d array using nested foor

Question

Abdullah Afar 2022-10-10

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1821175-print-2d-array-using-nested-foor

回答： Dyuman Joshi 2022-10-11

Hello, I want to print an array as follows

9 9 9 9 9 9 9 9 9 9

8 8 8 8 8 8 8 8 8 8

7 7 7 7 7 7 7 7 7 7

6 6 6 6 6 6 6 6 6 6

5 5 5 5 5 5 5 5 5 5

4 4 4 4 4 4 4 4 4 4

3 3 3 3 3 3 3 3 3 3

2 2 2 2 2 2 2 2 2 2

1 1 1 1 1 1 1 1 1 1

0 0 0 0 0 0 0 0 0 0

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Dyuman Joshi 2022-10-10

What have you tried yet? What is the error you are facing? Show your code.

Abdullah Afar 2022-10-11

for i=1:10 for i=1:10 a(i,j)=i-1 end end In this code print 000000000 111111111 222222222 333333333 444444444 555555555 666666666 ... 9999 But I want to 999999999 888888888 777777777 666666666 ... 00000

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Answer 1

Dyuman Joshi 2022-10-11

2
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1821175-print-2d-array-using-nested-foor#answer_1071683

在 MATLAB Online 中打开

%Updating your solution
%pre-allocation
a=zeros(10);
for i=1:10
    for j=1:10
        a(i,j)=10-i;
    end
end
a
a1 = 10×10
     9     9     9     9     9     9     9     9     9     9
     8     8     8     8     8     8     8     8     8     8
     7     7     7     7     7     7     7     7     7     7
     6     6     6     6     6     6     6     6     6     6
     5     5     5     5     5     5     5     5     5     5
     4     4     4     4     4     4     4     4     4     4
     3     3     3     3     3     3     3     3     3     3
     2     2     2     2     2     2     2     2     2     2
     1     1     1     1     1     1     1     1     1     1
     0     0     0     0     0     0     0     0     0     0

You can also get the same result (directly) by using some other functions (if using for loop is not necessary) -

[~,y]=meshgrid(9:-1:0)
y = 10×10
   9     9     9     9     9     9     9     9     9
   8     8     8     8     8     8     8     8     8
   7     7     7     7     7     7     7     7     7
   6     6     6     6     6     6     6     6     6
   5     5     5     5     5     5     5     5     5
   4     4     4     4     4     4     4     4     4
   3     3     3     3     3     3     3     3     3
   2     2     2     2     2     2     2     2     2
   1     1     1     1     1     1     1     1     1
   0     0     0     0     0     0     0     0     0
x=repelem((9:-1:0)',1,10)
ans = 10×10
   9     9     9     9     9     9     9     9     9
   8     8     8     8     8     8     8     8     8
   7     7     7     7     7     7     7     7     7
   6     6     6     6     6     6     6     6     6
   5     5     5     5     5     5     5     5     5
   4     4     4     4     4     4     4     4     4
   3     3     3     3     3     3     3     3     3
   2     2     2     2     2     2     2     2     2
   1     1     1     1     1     1     1     1     1
   0     0     0     0     0     0     0     0     0