How would I create a loop that ensures that all negative values of my function turn into zero?

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Ruten9 2015-10-25

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https://ww2.mathworks.cn/matlabcentral/answers/250970-how-would-i-create-a-loop-that-ensures-that-all-negative-values-of-my-function-turn-into-zero

关闭： Walter Roberson 2015-10-26

%% Problem 2

%Part A clear all; clc; t = 0:.01:35; h = height(t)

%Part C (maxima) [xpsudeomax,ymax] = max(h(t)); xrealmax = t(ymax); maxfunction = [xrealmax,ymax]; %fminbnd function [xmax2,ymaxpsudeo]= fminbnd(@(t) (-1.*h(t)),0,30); yrealmax = -1.*ymaxpsudeo; format long g fminbndmax = [xmax2,yrealmax] ; %Part D [xzero,ypsuedozero]= fzero(@(t) h(t),20); yrealzero = round(ypsuedozero); ZERO = [xzero,yrealzero];

%Part B (height vs time)

figure; plot(t,h(t),'blue',xmax2,yrealmax,'go','LineWidth',2); hold on; plot(xzero,yrealzero,'r.','MarkerSize',20); title('Rocket Trajectory'); ylabel('altitude [m]'); xlabel('time [sec]'); axis([0 35 -500 1500]); legend('height','max','ground','location','ne')

my height file (this was its own m-file): function h = height(t)

h = @(t) ((-9.8).*(2.^(-1))).*(t.^2) + 125.*t + 500;

%h(h<0) = 0;

if(h(t) <0) h(t) =0 end end