Condition on zero crossing

Question

letoppina 2018-2-27

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/385187-condition-on-zero-crossing

编辑： lokender Rawat 2018-3-6

Hi everybody,

I need to make an if statement on a zero crossing of an array (composed of n variable). In particular, I need to find when my array crosses the zero and based on that moment make the if statement. For example:

if array == 0 (that states for: when my array crosses zero)
 bla bla bla
else
 bla bla bla
end

(the problem is that in my array there is not a value that corresponds exactly to zero).

P.S. Sorry for my lack of precise information, I'm new in matlab.

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Answer 1

lokender Rawat 2018-3-6

0
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https://ww2.mathworks.cn/matlabcentral/answers/385187-condition-on-zero-crossing#answer_308610

编辑：lokender Rawat 2018-3-6

在 MATLAB Online 中打开

Since you mentioned that there is no single value in the array which equals zero. And you specifically want to do some task when there is a zero crossing and other task when it does not. So I have included a sample script below:

% numZeroCross() will return the number of zero-crossing in the array
% passed as parameter 
function times=numZeroCross(x)
len=length(x);
count=0;
   for i=1:len-1
      if((x(i)*x(i+1)) < 0)
        disp('zero crossing');
        %do something
        count=count+1;
      else
        disp('not a zero crossing');
        %do something
      end
   end
times=count;
end