Why does my script keep getting the Error using ./ Matrix dimensions must agree when calculating y in the script

my function

function [d,t,y_max] = fire_projectile(v,y0,theta)
%v is initial velocity
%y0 is launch height
%theta is launch angle
g=9.81;
d = ((v.*cos(theta))/g).*((v.*sin(theta))+((((v.*sin(theta)).^2)+(2.*g.*y0))).^0.5);
%d is the overall distance traveled
y_max = y0 + ((v.*sin(theta))/(2.*g));
%y_max is max height reached
t= d/(v.*cos(theta));
%time travelled

my script

clear
g=9.81; %value for gravity
v=input('input initial velocity ','s');
y0 = input('input launch height ','s');
theta=10;
[d,t,y_max] = fire_projectile(v,y0,theta);
x=0:1:d(1);
y = (x*tan(theta))-((g*(x.^2))./(2.*((v.*cos(theta)).^2)));
plot(y,x);
%y is the height at position x

i only get the error when inputs for v and y0 are greater than 10, which they need to be.

edit:

these are the 2 errors i get

Error using ./

Matrix dimensions must agree.

Error in fire_projectile_script (line 8)

y = (x*tan(theta))-((g*(x.^2))./(2.*((v.*cos(theta)).^2)));

outputs seen in workspace

d: [-60.5,-58.2]

g: 9.81

t: 1.43

y_max: [47.6, 46.7]

[madhan ravi]

after running the code type d in command window and see the mistake you made , why do you people always supress the output?

[henry mulligan]

i dont supress the output, i have workspace open so see all outputs there

[madhan ravi]

Type

0 : 1 : -60.5

in command window

[henry mulligan]

done, not sure what its supposed to achieve as the command window is seperate to my script

[madhan ravi]

it relates to the below code:

x=0:1:d(1);

[henry mulligan]

ok so i changed it, know I get the error that matrix dimensions must agree. also still get this

Error in fire_projectile_script (line 8)

y = (x.*tan(theta))-((g.*(x.^2))./(2.*((v.*cos(theta)).^2)))

[madhan ravi]

can you organise your code and provide all the necessary datas(v,y0,theta) to test your code?

[henry mulligan]

new script code

clear
g=9.81; %value for gravity
v=30
y0=10
theta=10;
[d,t,y_max] = fire_projectile(v,y0,theta);
x=0:1:65;
y = (x.*tan(theta))-((g.*(x.^2))./(2.*((v.*cos(theta)).^2)));
plot(y,x);
%y is the height at position x

Answer 1

[madhan ravi]

clear
g=9.81; %value for gravity
v=30
y0=10
theta=10;
[d,t,y_max] = fire_projectile(v,y0,theta);
x=0:1:65;
y = (x.*tan(theta))-((g.*(x.^2))./(2.*((v.*cos(theta)).^2)));
plot(y,x);
 
 
function [d,t,y_max] = fire_projectile(v,y0,theta)
%v is initial velocity
%y0 is launch height
%theta is launch angle
g=9.81;
d = ((v.*cos(theta))/g).*((v.*sin(theta))+((((v.*sin(theta)).^2)+(2.*g.*y0))).^0.5);
%d is the overall distance traveled
y_max = y0 + ((v.*sin(theta))/(2.*g));
%y_max is max height reached
t= d/(v.*cos(theta));
end

[henry mulligan]

thank you for your help, also looking at the code you wouldnt be able to help me work out why d is coming out negative when all the inputs are positive

[madhan ravi]

cos(theta) %this is why

so if theta is degree then you should simply put

cosd(theta) 

if theta is degrees then f you want to convert it to radians then

cos(deg2rad(theta))

[henry mulligan]

but for the theta value of 10, cos(theta) is positive, so should not make d negative?

[madhan ravi]

10 is degrees or radians ? clarify my question

[henry mulligan]

i had 10 degrees, so just converted everything to radians, thank you for the comment

[madhan ravi]

Anytime :)

[henry mulligan]

This is my final script

clear
g=9.81; %value for gravity
vi=input('input initial velocity ','s');
yi=input('input launch height ','s');
v=vi;
y0=yi;
%theta is the angle of launch
%y is the height at position x

specifically focusing on the beginning. when the inputs v and y0 are numbers the script works fine, however when im asking for an imput i get this error occuring.

Error using +

Matrix dimensions must agree.

Error in fire_projectile_script (line 12)

y1 = y0+(x1.*tan(deg2rad(theta)))-((g.*(x1.^2))./(2.*((v.*cos(deg2rad(theta))).^2)));

i dont know why I am getting this when the inputs are the same, I am just choosing an input.

edit; i removed half the code so that my entire answer cannot be seen as the question only relates to the first part

[madhan ravi]

provide your input datas

[madhan ravi]

vi=input('input initial velocity ','s');
yi=input('input launch height ','s');

should be

vi=input('input initial velocity ');
yi=input('input launch height ');

[henry mulligan]

again thanks for the help, sorted the problem out

[madhan ravi]

Anytime :)