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How do I deal with this function handel error?

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Ruten9
Ruten9 2015-10-25
关闭： MATLAB Answer Bot 2021-8-20
my height file:
function h = height(t)
h = @(t) ((-9.8).*(2.^(-1))).*(t.^2) + 125.*t + 500;
h(h<0) = 0;
if h(t) <0
then h=0
end
end
My main file:
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 0 1500]);
legend('height','max','ground','location','ne')
I keep getting the
"Undefined operator '<' for input arguments of type 'function_handle'.
Error in height (line 7)
h(h<0) = 0;"
How would I resolve this? I got everything on my graph right, but I can't get the flat,horizontal line to appear at the very end.

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回答（1 个）

Gareth Thomas
Gareth Thomas 2015-10-25
Try to remove: h(h<0) = 0;
From your height function. This will help you.
  2 个评论
Ruten9
Ruten9 2015-10-25
My hw says that it should be there. I'm not sure why though.
Walter Roberson
Walter Roberson 2015-10-26
Then either your "hw" is wrong or you have misinterpreted your "hw" or you have implemented in a way that you are not intended to use.

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