how can I plot into matlab

[negar]

hello all
I want to write matlab cod for :

x=10:1:20;


.5*pi*(1.5^2)[0.00333*(1.5*y/x)+0.00433*((1.5*y/x)^3)-7.26e-5((1.5*y/x)^5)]*x^3=1250;
plot(y,x)

 

[Nora]

The trouble with your code is that the argument in the second line is a bit off syntax-wise. Try to simplify it by breaking the calculation up into 2 lines for clarity.

Plotting example:

t = 1790:10:2000;
P = 197273000./(1+exp(-0.03134*(t-1913.25)));
plot (t,P);

 

[hyper145]

there are various ways to plot this in MATLAB:
1. u can use the symbolic tool box
2. u cn use the anonymous function

it depends on the one that u want
well let use the editor by typing edit at the command prompt;
the editor opens
now type
x=10:1:20;
5*pi*(1.5^2)*[0.00333*(1.5*y/x)+0.00433*((1.5*y/x)^3)-7.26e-5*((1.5*y/x)^5)]*x^3=1250;
find or pretty u can also use feval
then u plot(x,y)
as at now i am talking a wild guess but i will solve this when i get home and resend you the correct solution.

 

[ladymaly]

to write this program you must forst simplify the equation to
y=[[5*pi*(1.5^2)*[0.00333*(1.5/x)+0.00433*((1.5/x)^3)-7.26e-5*((1.5/x)^5)]*x^3]/1250]^-1;
you don't have to write the step that you want to use for " x=10:1:20 "
so the program will be like this
x=10:20;
y=[[5*pi*(1.5^2)*[0.00333*(1.5/x)+0.00433*((1.5/x)^3)-7.26e-5*((1.5/x)^5)]*x^3]/1250]^-1;
plot(x,y)

I hope that this is the answer you are looking for

cheers

 

[pngzhi]

You should find y values by fsolve function and then use plot.