How can i changethe value at a position in an array

Question

Deniz Bozdogan 2021-6-20

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/860730-how-can-i-changethe-value-at-a-position-in-an-array

回答： Star Strider 2021-6-20

采纳的回答： Star Strider

Hello, i wanted to cahnge some values in an array but could not do it, can you help me? Thanks in advance.

k=zeros(201);

k(0)=0;

k(101)=1;

k(201)=2;

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Answer 1

Star Strider 2021-6-20

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/860730-how-can-i-changethe-value-at-a-position-in-an-array#answer_728905

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The ‘k’ array is a (201x201) array of zeros. The code likely works correctly, however using a single index into an array uses linear indexing. To understand the row and column assignments for element 101 and 201, use the ind2sub function:

k = zeros(201)
k = 201×201
     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0
k(101)=1;
[r1,c1] = ind2sub(size(k), 101)
r1 = 101
c1 = 1
k(r1,c1)
ans = 1
k(201)=2;
[r2,c2] = ind2sub(size(k), 201)
r2 = 201
c2 = 1
k(r2,c2)
ans = 2