for loop/indexing assistance for simple plot script

Question

Joe 2012-7-9

0
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https://ww2.mathworks.cn/matlabcentral/answers/43163-for-loop-indexing-assistance-for-simple-plot-script

hey everyone,

I'm working on a hmwk assignment where I have to use function handles to create points for a plot. I'm allowed 1 for loop to run through an array A for different angles, which I then calculate and plot trajectories for. here is my code, currently I get a plot of one trajectory, and it doesn't seem to run through all the values of A, only the first. any help would be appreciated.

clc clear

%constants

g= 1.62;%m/s v= 10; %m/s A= [15 30 45 60 75]'; %degrees

%functions with handles tof,h,x tof=@(A)(2*v/g)*sind(A); %time of flight h=@(t,A)v.*t*sind(A)-.5*g*(t.^2); %height of ball x=@(t,A)v.*t*cosd(A); %horizontal distance

hold all for i=1:length(A) ts=tof(A(i)); t=linspace(0,ts,30); H=h(t(:),A(i)); X=x(t(:),A(i));

end plot(X,H)

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Answer 1

bym 2012-7-9

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https://ww2.mathworks.cn/matlabcentral/answers/43163-for-loop-indexing-assistance-for-simple-plot-script#answer_53059

在 MATLAB Online 中打开

Move your plot command to inside the loop, as in:

clc; clear
%constants
g= 1.62;%m/s
v= 10; %m/s 
A= [15 30 45 60 75]'; %degrees
%functions with handles tof,h,x 
tof=@(A)(2*v/g)*sind(A); %time of flight
h=@(t,A)v.*t*sind(A)-.5*g*(t.^2); %height of ball
x=@(t,A)v.*t*cosd(A); %horizontal distance
hold all
for i=1:length(A) 
    ts=tof(A(i));
    t=linspace(0,ts,30);
    H=h(t(:),A(i));
    X=x(t(:),A(i));
plot(X,H)
end