Please someone tell me what's wrong with my code, it keeps on returning the message, ''Unrecognized variable of v''. The image below the code is the problem?

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Abdulswamad Salim 2020-4-27

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评论： Abdulswamad Salim 2020-4-27

采纳的回答： Mrutyunjaya Hiremath

function distance = DTask1_f(v, theta);

h0 = 1.8;

g = 9.8;

v = 60;

t = linspace(0,1,1000);

x=v*cos(theta*pi/180)*t;

y=h+v*sin(theta*pi/180)*t-.5*g*t.^2;

c = find(y<0);

if isempty (c);

disp('The ball does not hit the ground in 10 seconds.');

distance = Nan

else

distance = x(c(1));

end

clear

v = 60;

theta = 0:1:60;

distance = zeros(1,61);

for i = 1:60

distance(i)=DTask1_f(v,theta(i));

end

figure

plot(theta,distance);

xlabel('Initial angle (deg)');

ylabel('Distance thrown (m)');

title('Distance of ball thrown as a function of release angle');

legend(['v= ' num2str(v)])

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Abdulswamad Salim 2020-4-27

Thank you so much brother Hiremath, seems it was a simple problem. You are appreciated.

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Answer 1

Mrutyunjaya Hiremath 2020-4-27

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Hello

There is a problem in the calculation of 'y' in function 'DTask1_f'

Calculated value first value is around 2.4, but it should come around 2.2 according to your graph.

I have done small corrections in you function code.

function distance = DTask1_f(v, theta)
h = 1.5;
g = 9.8;
% v = 60;
t = linspace(0,1,1000);
x = v * cos(theta*pi/180) * t;
y = h + v * sin(theta*pi/180) * t -.5*g*t.^2;
c = find(y<0);
if isempty (c);
    disp('The ball does not hit the ground in 10 seconds.');
    distance = NaN;
else
    disp('The ball hit the ground in 10 seconds.');
    distance = x(c(1));
end