finding a number in the vector equal or around a desired number

Question

Othman Alkandri 2022-12-30

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1886467-finding-a-number-in-the-vector-equal-or-around-a-desired-number

评论： Othman Alkandri 2023-1-2

I am trying to the from dleta_A vector a number equal to 3.1528 or two numbers rounded up and down for the desired number

V_breadth = 12;
d_Vd = 0:0.005:2;
V_Draft_min = 0.5;
V_breadth_min = 0.4*V_breadth;
V_breadth_max = 0.8*V_breadth;
for i = 1:1:length(d_Vd)
V_Draft_new(i) =V_Draft_min+ d_Vd(i);
tan_theta = (V_Draft - V_Draft_min )/(0.5*(V_breadth_max-V_breadth_min));
Vb(i) = V_breadth_min +  (d_Vd(i).*(2/tan_theta));
dleta_A(i) = (V_breadth_min+ Vb(i)) *d_Vd(i)/2;
end
V_Draft_new 
Vb
dleta_A

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Answer 1

Image Analyst 2022-12-30

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1886467-finding-a-number-in-the-vector-equal-or-around-a-desired-number#answer_1138622

在 MATLAB Online 中打开

Try this

% Create sample data
dleta_A = 4 * rand(1, 1000)
dleta_A = 1×1000
    1.3165    0.9536    1.6464    3.0427    3.4164    2.8714    2.8714    1.5470    3.9519    3.3921    2.2466    3.1289    2.5613    3.5461    3.0159    3.7663    3.6834    1.4579    3.4715    1.1341    3.1148    3.3452    2.9969    0.6242    2.5960    3.9745    2.0811    1.2933    0.1543    1.7560
% Find element of dleta_A that is closest to 3.1528.
differences = abs(dleta_A - 3.1528);
[minDifference, indexOfMin] = min(differences)
minDifference = 0.0022
indexOfMin = 871
closestValue = dleta_A(indexOfMin)
closestValue = 3.1550