Repeating for loop until getting a list of solution

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Abdullah Al Shereiqi 2020-3-17

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回答： Abdullah Al Shereiqi 2020-3-17

Hi to all

I'm not that good in Matlab and I tried to learn it. I used for loop to create a solution for each value of (n) and repeating the for loop. The for-loop is from 1 to 8760 while n is from 0 to 1 with increament of 0.1.

I want to repeat the for-loop for each (n) and finally make a vecto of [n, solution from for-loop]. Attached flow chart may explain more about what I want.

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Rik 2020-3-17

在 MATLAB Online 中打开

Apart from the suggestion from Guillaume; I forgot to account for floating point rounding errors.

s=0;
for k=1:10
    s=s+0.1;
end
clc
fprintf('%.53f\n',s) %not quite equal to 1

The solution in this case is to use a tolerance:

s==1 %returns false, because s is 0.99999999999999988897769753748434595763683319091796875
abs(s-1)<=2*eps %returns true

Sriram Tadavarty 2020-3-17

You could even break when s is greater than 1, example, the condition of if s > 1, can be placed, rather than s == 1 to deal with tolerance issues.

Or it can be directly placed a loop for 100 times, in each time 0.01 can be added.

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Answer 1

Guillaume 2020-3-17

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If it's a flow chart you've been given, then you are entitled to complain loudly. That flow chart is very misleading. The layout is a more representative of a while loop than a for loop.

This is what you're meant to do:

for n = 0:0.1:1 %represented by 4 boxes on the flow chart! (n = 0, for-loop, n=1?, increment by 0.1)
    %do calculation inside the loop (1 box on the chart)
end
%get a vector of solution (1 box on the chart)