why is my code not working?

2019 5 19
2 个回答
回答已采纳
更新时间：2019 5 19
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0 个投票

I should make an iterative cylce, yet when trying to run it gives me this error
Array indices must be positive integers or logical values.
for i= linspace(0.0001,0.0009,1000)
Fm= (0.25).*(((log((2.7*10^-5)+(2.51.*((Rey.*sqrt(i).^-1))))).^-1).*((log((2.7*10^-5)+(2.51.*((Rey.*sqrt(i).^-1)))))).^-1);
if Fm(i)-Fm(i+1)<= abs(10^-6)
break
end
end

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 采纳的回答

KALYAN ACHARJYA
KALYAN ACHARJYA 2019-5-19
编辑：KALYAN ACHARJYA 2019-5-19

0 个投票

i= linspace(0.0001,0.0009,1000)
%.................^ ...........^............
Array indices must be non zero positive integer
like
linspace(1,1,1000)
Aprat from the above issue there is undefined function or variable 'Rey'. Ensure that it is there in your complete code.

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Franco Belletti
Franco Belletti 2019-5-19
I don't think the problem is the linspace as it gives me the row with values I need Rey is ofcourse defined in my code, but the problem regards the loop, I'd like to know what does the eror mean, again that being
Array indices must be positive integers or logical values. which particulary refers to my If cylce
if Fm(i)-Fm(i+1)<= abs(10^-6)
KALYAN ACHARJYA
KALYAN ACHARJYA 2019-5-19
I have answered based on the error
Array indices must be positive integers or logical values.
With this line space i= linspace(0.0001,0.0009,1000)
if Fm(i)-Fm(i+1)<= abs(10^-6)
This does not work
Say i=0.0001, that is first value
Fm(i)>>Fm(0.0001) does it have any menaing
%...^................^ ...these are called indices of an array, it must be non zero positive interger.
Franco Belletti
Franco Belletti 2019-5-19
crystal clear thanks!
KALYAN ACHARJYA
KALYAN ACHARJYA 2019-5-19
Welcome @Franco If your question is answered, you can give credit to the answer by accepting it.

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更多回答（1 个）

madhan ravi
madhan ravi 2019-5-19
编辑：madhan ravi 2019-5-19

1 个投票

Probably you want (no loops needed):
ii = linspace(0.0001,0.0009,1000);
Fm = (0.25).*(((log((2.7*10^-5)+...
(2.51.*((Rey.*sqrt(ii).^-1))))).^-1).*((log((2.7*10^-5)...
+(2.51.*((Rey.*sqrt(ii).^-1)))))).^-1);
First_encounter = find(abs(Fm(1:end-1)...
-Fm(2:end))<= 1e-6,1,'first')

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