Printing iterations in while loop

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

Answer 1

[Stephen23]

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.

[Nicholas Fornaciari]

How would i go about changing the formula so it does it for a certain number of iterations?

[Stephen23]

"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