i'm getting an error that inputs should be scaler on "t=linspac​e(0,t_flig​ht,30);"

       v0=app.InitialvelocityEditField.Value;
            y0=app.InitialheightEditField.Value;
            theta=app.InitialangleEditField.Value;
            g=app.gEditField.Value;
            x0=0;
            b=v0*sin(pi*(theta/180));
            a=-g/2;
            c=y0;
            t_flight=(-b-sqrt(b^2-4*a*c))/(2*a);
            t_flight=app.FlighttimeEditField.Value;
            range=v0*cos(pi*(theta/180))*t_flight;
            range=app.DistancetraveledEditField.Value;
            t=linspace(0,t_flight,30);
            xdot0=v0*cos(pi*(theta/180));
            ydot0=v0*sin(pi*(theta/180));
            m_y=y0+(v0.^2)*(sin(pi*(theta/180)))^2/(2*g);
            m_y=app.maximumheightEditField.Value;
            x=x0+xdot0*t;
            y=y0+ydot0*t-(g/2)*t;
            plot(app.UIAxes,x,y)
            legend(app.UIAxes,'projectile')

[Atsushi Ueno]

As the error message said, t_flight is vector value. linspace() does not accept vector value as input.

t_flight=(-b-sqrt(b^2-4*a*c))/(2*a);
t_flight=app.FlighttimeEditField.Value; % <== It must be vector. BTW why do you overwrite t_flight?

I think you should select scalar value from "app.FlighttimeEditField.Value".

[Mahmoud Chawki]

t_flight=(-b-sqrt(b^2-4*a*c))/(2*a)

the result of this is a scalar.

how is it defining it as a vector.

i want GUI to show the result of the time flight

[DGM]

As Atsushi mentioned, this:

t_flight=(-b-sqrt(b^2-4*a*c))/(2*a)

is immediately discarded and replaced with this:

t_flight=app.FlighttimeEditField.Value;

The second line produces a nonscalar result

[Mahmoud Chawki]

okay, thank you !

[Image Analyst]

What is the value of t_flig​ht?

t_flig​ht 
whos t_flig​ht

[Mahmoud Chawki]

it is the time traveled by the projectile (from 0 to x)

[Jan]

@Mahmoud Chawki: Image Analysts asked for the value and type, not the meaning.