selecting an element of a vector

Question

PJS KUMAR 2018-10-23

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/425679-selecting-an-element-of-a-vector

回答： PJS KUMAR 2018-10-25

采纳的回答： KALYAN ACHARJYA

在 MATLAB Online 中打开

How to select an element of a vector which is nearest to the given value xp.

Suppose we have a vector

x=[1 1.05 1.1 1.15 1.2 1.25]  
a) if xp=1.18, the output should be 1.2 (which is nearest to 1.18)
b) if xp=1.12, the output should be 1.1 (which is nearest to 1.12)

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madhan ravi 2018-10-23

编辑：madhan ravi 2018-10-23

b) if xp=1.12, the output should be 1.1 (which is nearest to 1.12)

nearest to 1.12 is 1.15 ?? not 1.1 , whats the logic behind it ,explain to understand

PJS KUMAR 2018-10-23

1.1 is nearest to 1.12 than 1.15

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Answer 1

KALYAN ACHARJYA 2018-10-23

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https://ww2.mathworks.cn/matlabcentral/answers/425679-selecting-an-element-of-a-vector#answer_342988

编辑：KALYAN ACHARJYA 2018-10-23

在 MATLAB Online 中打开

x=[1 1.05 1.1 1.15 1.2 1.25];
xp=input('Enter the xp value: ');  
[d, idx]=min(abs(x-xp));
fprintf('The output is%.2f',x(idx));

Command Window

Enter the xp value: 1.18
The output is1.20

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PJS KUMAR 2018-10-23

What is [d, idx]

KALYAN ACHARJYA 2018-10-23

编辑：KALYAN ACHARJYA 2018-10-23

idx is giving the index position of x, which is close to xp

if idx=1, that means x(idx)=x(1)=1 (First element)

d gives the minimum difference of x-xp, abs absolute value (+ve)

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Answer 2

PJS KUMAR 2018-10-25

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https://ww2.mathworks.cn/matlabcentral/answers/425679-selecting-an-element-of-a-vector#answer_343279

在 MATLAB Online 中打开

How to select an element of a vector which is previous to the given value xp.

Suppose we have a vector

x=[1 1.05 1.1 1.15 1.2 1.25]  
a) if xp=1.18, the output should be 1.15 (which is previous to 1.18)
b) if xp=1.12, the output should be 1.1 (which is previous to 1.12)