how can i overcome this error ?

Question

amir 2013-9-11

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/86858-how-can-i-overcome-this-error

t = 0:0.0001:0.07;
v0 = input('please Enter the value for v0:');
R = input('please Enter the value for resistance:');
C = input('please Enter the value for capacitacne:');
f = input('please Enter the value for frequency:');
m = length(t);
state = 'on';
for A = 1:m
    switch state 
        case 'on'
    vs(A) = v0 * sin(2*pi*f*t(A));
    vR(A) = vs(A);
    iR = vR(A)/R;
    iC = 2*pi*f*C*v0*cos(2*pi*f*t(A));
    I = iC + iR;
    if I<=0
       state = 'off';
       tA = t(A);
    end
        case 'off'
    vR(A) = v0*sin(2*pi*f*tA)*exp(-(t(A)-tA)/(R * C));
      if vs(A) >= vR(A)
          state = 'on';
      end
    end
end
plot (t,vs,':',t,vR,'k')
 Error:
 ??? Attempted to access vs(45); index out of bounds because numel(vs)=44.
 Error in ==> untitled1 at 24
      if vs(A) >= vR(A)

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Answer 1

Walter Roberson 2013-9-11

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https://ww2.mathworks.cn/matlabcentral/answers/86858-how-can-i-overcome-this-error#answer_96406

In the case of 'off', you make an assignment to vR(A) but not to vs(A), but then you attempt to compare vR(A) to the (non-existent) vs(A). You need to decide what value vs(A) should have at that point and make sure the assignment happens.