It only shows the else value if value of b crosses 15 even once.

Question

Adhish Aggarwal 2017-4-19

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/336077-it-only-shows-the-else-value-if-value-of-b-crosses-15-even-once

关闭： MATLAB Answer Bot 2021-8-20

b =  AXIS(1:100,1) - KOTAK(1:100,1);
avg5 = zeros(5,1);
for k = 5:length(b)
    avg5(k) = mean(b(k-4:k,1));
end
a = 0;
avg5 = [a;avg5];
avg5(numel(avg5),:) = [];
std5 = zeros(5,1);
for al = 5:length(b)
    std5(al) = std(b(al-4:al,1));
end
% a = 0;
std5 = [a;std5];
std5(numel(std5),:) = [];
up5 = zeros(length(std5),1);
for d = 1 : length(std5)
    if abs(b) < 14.5
       up5(d) =  std5*2 + avg5;
     down5(d) = std5*(-2) + avg5;
    else
       up5(d) =  std5*2 + avg5;
     down5(d) = std5*(-2) + avg5;
    end
end
It works well till up5 = zeros(length(std5,1));

3 个评论
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Geoff Hayes 2017-4-19

Adhish - how is b set? Please post more of your code.

Adhish Aggarwal 2017-4-19

I have mine given my full code p above. Please let me know. Thank you

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Answer 1

Steven Lord 2017-4-19

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/336077-it-only-shows-the-else-value-if-value-of-b-crosses-15-even-once#answer_263594

That's the correct behavior. From the documentation for the if keyword: " if expression, statements, end evaluates an expression, and executes a group of statements when the expression is true. An expression is true when its result is nonempty and contains only nonzero elements (logical or real numeric). Otherwise, the expression is false. "

In your case, you probably want to use logical indexing instead.