Printing iterations in while loop

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Nicholas Fornaciari
评论： Stephen23 2019-6-4
I've been trying to print each iteration of this loop without any sucess. I've tried various verison of fprintf even setting a blank variable to display after and it never works.
myfunction = @(x) x^2-2;
i = 0;
xl = input('X upper ');
xu = input('X lower ');
xmid = (xl+xu)/2;
fprintf('\tI \txl \txu \txmid')
while i > 100
if (myfunction(xmid) * myfunction(xu))<0
xl = xmid;
else
xu = xmid;
end
xmid = (xl + xu)/2;
i = i+1;
fprintf('\n \n \n \n',i, xl,xu,xmid)
end

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回答（1 个）

Stephen23
Stephen23 2019-6-3
编辑：Stephen23 2019-6-3
Your second fprintf simply prints four newlines, and ignores its inputs. As the fprintf documentation shows, you need to include some numeric conversion format operators in order to print the values of any variables, e.g.:
fprintf('\t%g\t%g\t%g\t%g\n',i,xl,xu,xmid)
Note that you define
i=0
and then you define the loop with:
while i > 100
but the condition is not true, so your loop will not even iterate once.
  2 个评论
Nicholas Fornaciari
Nicholas Fornaciari 2019-6-3
How would i go about changing the formula so it does it for a certain number of iterations?
Stephen23
Stephen23 2019-6-4
"How would i go about changing the formula so it does it for a certain number of iterations?"
Use a for loop:
for k = 1:100
...
end

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