Implementing a while loop into my code?

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Tyler Silva 2015-10-23

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回答： Star Strider 2015-10-23

wl.m

I attached the script for my code. I want a whike loop that will calculate the estimate for the sine of the angle by adding one additional term from the Taylor Series polynomial (which is the Estimate= equation) each iteration through the loop. The while loop should continue as long as the absolute value of the difference between the most recent estimate and the previous estimate exceeds 0.00001 (1e-5). Is my code correct, Do i need to move my Error line up in the while loop, so it keeps running?

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Answer 1

Star Strider 2015-10-23

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There were a few problems, the most significant being that you need to compare ‘Previous’ and Estimate in the while statement. Others were that you needed to initialise some variables before the loop, and iterate ‘k’:

%%Problem 3
Angle = input('Enter an angle in radians between 0 and 2pi: ');
Terms = input('Enter the desired number of terms for Taylor Series: ');
Estimate = 0; % Initialize Estimate
Previous = 10;                                                                  % CHANGED: Initialise ‘Previous’
k = 1;                                                                          % CHANGED: Initialise ‘k’
while abs(Estimate-Previous)>0.00001                                            % CHANGED: ‘abs’ Argument
 Previous=Estimate;
 Estimate = Estimate + (-1)^(k-1)*Angle^(2*k-1)/factorial(2*k-1);
 k = k + 1;                                                                     % CHANGED: Iterate ‘k’
 % New value for Estimate = Old value for Estimate plus Next Term in
 % Taylor Series
end
Error = abs(sin(Angle)-Estimate);
fprintf('The Taylor Series estimate for sin(Angle) is: %0.6f \n',Estimate);
fprintf('The actual value for sin(Angle) is: %0.6f \n',sin(Angle));
fprintf('The absolute error in the estimate is: %0.6f \n',Error);