Thanks If it was say 3.5*10^10*x^2 that i wanted to plot maple gives these as long numbers on the scale is there any way to constarin this to g*10^5 say i.e so that it is essentially 10^ rather than a long number?

thanks that is awesome, can I ask how you arose at the intitial conditions that you used because i am always unsure what to do here?

no sorry that isnt what i mean it was just a differnetial equation

yeah thx figured it out and have:

except now the first one is wrong as it should be constant between x=0 and 4.6*10^2, also can they easily be coombined?

Download Case_I.mw

hi thanks guys, with that change though maple will produce a graph with nothing on it, does anyone know why?

thx guys, is there a setting to allow for X(1) to be a very large number, because when i try and plot say 10^20 it wont work?

thx guys you have been really helpful, is it possible to get these bot honto the same plot?

thx, i have two quick questions, is it possible to joing the two up? Clearly there would have to be a gap in between. Also is it possible to plot multpiple piecewise functins, or piecewise and non piecewise functions on the same graph?

yeah thats what i thought it is so frustrating i am just trying to plot some graphs grrrr.

If T(x)=R^1/4(x)/x, would that be enough? 

Sorry it's hard for me to understand what i actuially need to do to plot the equation, i have a simpler form which if i can do then i can work the above one out for myself.

The set of diffferential equations are: 

> U := diff(X(x), x) = -10*(1-5*T(x)^2)^(1/2)*x*X(x)/(X(x)*x+R(x)), diff(R(x), x) = 10*(1-5*T(x)^2)^(1/2)*x^2*X(x)/(X(x)*x+R(x));
                                       (1/2)         
                          /          2\              
           d           10 \1 - 5 T(x) /      x X(x)  
          --- X(x) = - ----------------------------, 
           dx                 X(x) x + R(x)          

                                       (1/2)        
                          /          2\       2     
             d         10 \1 - 5 T(x) /      x  X(x)
            --- R(x) = -----------------------------
             dx                X(x) x + R(x)        
> initial; R(x) = 0, X(x) = 10;

I again apologise for not being very helpful earlier.

Hi I get this error and thew graph won't update from 5,

Error, (in dsolve/numeric/process_input) incorrect form for derivatives: {(diff(diff(F(t), t), t))(x)}
Error, (in plots/odeplot) input is not a valid dsolve/numeric solution

thx

yeah i have this equation but want to plot R(x), Z(x) and P(x) against x  

Thanks i actually wanted to plot values from 10^-10 to 10^10 and thought tha perhaps the answer would help me to do that, is it possible to get maple to insert values with an increment of say 10 in that range?