How to draw a 3d rectangular box with open top using its Base Length and Height .

how can i use length width and height instead of cordinates to draw a 3d rectanuglar box with open top .Is there any function reserved for that job.Looking forward to your response.

[darova]

Do you have any picture of result?

[Muhammad Ashar Tanveer]

this script optimizes the cheapest cost for an open top rectangular box it works fine until i display the cheapest cost of a box but when i try to use the length ,width and height of the box to plot its 3d diagram of a box it throws an error that " Error using patch Vectors must be the same length."

regards.

 %% Cheapest Price for Rectangular Box
    %%
    vol=input('Enter volume of box : ');
    syms l x h positive
     eqn=10*2*x*x+12*2*x*(vol/(2*x*x))+12*(vol/(2*x*x))*x;
    seceqn=diff(eqn);
     width=solve  (seceqn==0,x);
    l=2*width;  
   h=vol/(l*width);
   
cost=10*2*width*width+12*2*width*(vol/(2*width*width))+12*(vol/(2*width*vol))*vol;
  
cost=double(cost);
        disp('Cheapest Cost is  = ');
    disp(cost);
 patch([0,l,l,0],[0,0,width,width],[0,0,0,0],'blue')
patch([0,l,l,0],[0,0,0,0],[0,0,h,h],'red')
patch([0,l,l,0],[width,width,width,width],[h,h,0,0],'green')
patch([0,0,0,0],[0,0,width,width],[0,h,h,0],'black')
patch([l,l,l,l],[0,0,width,width],[h,0,0,h],'yellow')

[darova]

The script you attached is working fine. Can you attached error script?

[Muhammad Ashar Tanveer]

but it is showing error to me i dont why i have copy pasted the script as it is i am using matlab ver R2015a

i can paste it again for you

 vol=input('Enter volume of box : ');
    syms l x h positive
     eqn=10*2*x*x+12*2*x*(vol/(2*x*x))+12*(vol/(2*x*x))*x;
    seceqn=diff(eqn);
     width=solve  (seceqn==0,x);
    l=2*width;  
   h=vol/(l*width);
   
cost=10*2*width*width+12*2*width*(vol/(2*width*width))+12*(vol/(2*width*vol))*vol;
  
cost=double(cost);
        disp('Cheapest Cost is  = ');
    disp(cost);
 patch([0,l,l,0],[0,0,width,width],[0,0,0,0],'blue')
patch([0,l,l,0],[0,0,0,0],[0,0,h,h],'red')
patch([0,l,l,0],[width,width,width,width],[h,h,0,0],'green')
patch([0,0,0,0],[0,0,width,width],[0,h,h,0],'black')
patch([l,l,l,l],[0,0,width,width],[h,0,0,h],'yellow')

[darova]

Enter volume of box : 5
Cheapest Cost is  = 
  103.0243

[Muhammad Ashar Tanveer]

you mean it working fine for you thus throwing error to me isn't it what did you say because confused