3 Errors involving linespace and multiplication symbol

Trying to code a projectiles motion from start to when it hits y=0. All the numbers/data is in. Part of the assignment is to create user-defined inputs as you'll see in the code. Problem i'm having is without any of the user inputs, the code runs fine. Once I insert user defined inputs, I get 3 errors.

The errors are:

Error using  .* 

Matrix dimensions must agree.

Error in linspace (line 30)
    y = d1 + (0:n1).*(d2 - d1)/n1;

Error in DummyCode (line 22)
t = linspace(0, tend, 1000);

I made a dummy file that's the exact same code as my assignment just without my comments,has the same errors, here it is:

a = input('45');

b = input('0');

c = input('0');

d = input('90');

Angle_deg = d;

Angle_rad = Angle_deg * pi/180;

V0 = a;

Vox = V0 * cos(Angle_rad);

Voy = V0 * sin(Angle_rad);

Y0 = c;

X0 = b;

g = -9.81;

ax = 0;

ay = g;

tend =  (-Voy - sqrt(Voy^2 - 4.*(.5.*ay).*Y0))/(2 .*((.5).*ay));

size(tend);

t = linspace(0, tend, 1000);

x = X0 + V0*t + .5 * ax * t.^2;

y = Y0 + V0*t + .5 * ay * t.^2;

plot(x,y)

Answer 1

[Walter Roberson]

I do not get any error when I run that code and answer to the input prompts with the value printed out in the prompt.

However I suspect that the actual input mechanism you are using is something like inputdlg(), which does not return numbers: it returns a cell array of character vectors.

[Moe]

Yeah I ended up figuring it out, in my inputs at the top I entered values where I should of put in questions/text to the user like "Insert velocity", that ended up fixing it and getting it running. Thanks for the answer though.