Matlab responds with 'busy'

When running the following code no output (graph) is given, instead matlab gives 'busy' in the bottem left hand corner. Any ideas?

if (x<=-d)      
           a = -g -s1*x/m_c -v*c/m_c + s2*x/m_c; 
           
     else  a = -g -s1*x/m_c -v*c/m_c;
          
     end 
         x = x + v*dt;
           v = v + a*dt;
           Disp(i)=x;
           Vel(i)=v;
           t=t+dt;
           Time(i)=t;
           i=i+1;
        
     end
      end

[Adam Danz]

Learn to use Debug Mode to quickly solve these types of issues.

https://www.mathworks.com/help/matlab/matlab_prog/debugging-process-and-features.html

Answer 1

[Walter Roberson]

     if (x<=-d)      

when that is true, you do not change t, and you get caught in an infinite loop.

Perhaps you want an "end" immediately after the second assignment

     if (x<=-d)      
           a = -g -s1*x/m_c -v*c/m_c + s2*x/m_c;   
     else
         a = -g -s1*x/m_c -v*c/m_c;
     end

[Ben Hatrick]

Thank you so much, massive help!