t(j) is coming up as an error when trying to graph values. what am i doing wrong

for i= 0:0.1:t1
    t(j)=i;
    h(j)=v*t(j)*sin(theta)-((g*t(j)*t(j))/2);
    x(j)=v*t(j)*cos(theta);
    j=(j+i);
end

Answer 1

[Star Strider]

It doesn’t appear that you have defined ‘j’ anywhere before the loop.

One possibility:

iv = 0:0.1:t1;
for j = 1:numel(iv)
    t(j)=iv(j);
    h(j)=v*t(j)*sin(theta)-((g*t(j)*t(j))/2);
    x(j)=v*t(j)*cos(theta);
    jv(j)=(j+iv(j));
end

[Ennis Winters IV]

sorry I forgot about that part i had

j=1; above the for loop.

[Star Strider]

The problem then is that you are adding ‘i’ to ‘j’. However, the elements of ‘i’ need to be integers, since MATLAB subscript references are defined as integers greater than zero.

I have edited my code creating ‘jv’ so that ‘j’ are only integers.