using a function to answer new questions

Question

jacob Mitch 2019-10-1

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/483129-using-a-function-to-answer-new-questions

评论： jacob Mitch 2019-10-1

I have created

function  y=Gss(n);
a=3; b=0.2; N(1)=0.2;
for v=2:n+1
    
   N(v)=exp(-a*N(v-1)^2)+b;
 
end
y=N(v);

How would I use this code to calculate something like

if abs(N(v-1)-N(v))<5
    answer=v
else v=v+1 'till you get the desired v'
end

Do I create another script and call Gss(n) or how would I write it in the first function file. I think I would have to use a loop for the second code

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Answer 1

David Hill 2019-10-1

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/483129-using-a-function-to-answer-new-questions#answer_394364

在 MATLAB Online 中打开

function  [N,answer] = Gss(n);
N=zeros(1,n+1);
answer=0;
a=3; b=0.2; N(1)=0.2;
for v=2:n+1
   N(v)=exp(-a*N(v-1)^2)+b;
   if abs(N(v-1)-N(v))<5
       answer=v;
   end
end
end

Or you could just wait to get array N back and then:

function  N = Gss(n);
N=zeros(1,n+1);
a=3; b=0.2; N(1)=0.2;
for v=2:n+1
   N(v)=exp(-a*N(v-1)^2)+b;
end
end
%once array N comes back
answer=find(abs(diff(N))<5)+1;%this provides multiple answers if multiple differences are <5

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jacob Mitch 2019-10-1

Hi Thanks David this really allows me to understand well, I just wanted to ask am I able to retain the first y=N(v) that I get from inputing n into Gss(n) value say answer1 and then proceed to calculate the second part as the smallest v such that abs(N(v) -N(v-1))<5 say answer2 whilst outputing each value of N(v) in the iteration.

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