woofwoof

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6 years, 223 days

MaplePrimes Activity


These are answers submitted by woofwoof

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:



with(plots)

[animate, animate3d, animatecurve, arrow, changecoords, complexplot, complexplot3d, conformal, conformal3d, contourplot, contourplot3d, coordplot, coordplot3d, densityplot, display, dualaxisplot, fieldplot, fieldplot3d, gradplot, gradplot3d, implicitplot, implicitplot3d, inequal, interactive, interactiveparams, intersectplot, listcontplot, listcontplot3d, listdensityplot, listplot, listplot3d, loglogplot, logplot, matrixplot, multiple, odeplot, pareto, plotcompare, pointplot, pointplot3d, polarplot, polygonplot, polygonplot3d, polyhedra_supported, polyhedraplot, rootlocus, semilogplot, setcolors, setoptions, setoptions3d, spacecurve, sparsematrixplot, surfdata, textplot, textplot3d, tubeplot]

(1)

 

 

[animate, animate3d, animatecurve, arrow, changecoords, complexplot, complexplot3d, conformal, conformal3d, contourplot, contourplot3d, coordplot, coordplot3d, densityplot, display, dualaxisplot, fieldplot, fieldplot3d, gradplot, gradplot3d, implicitplot, implicitplot3d, inequal, interactive, interactiveparams, intersectplot, listcontplot, listcontplot3d, listdensityplot, listplot, listplot3d, loglogplot, logplot, matrixplot, multiple, odeplot, pareto, plotcompare, pointplot, pointplot3d, polarplot, polygonplot, polygonplot3d, polyhedra_supported, polyhedraplot, rootlocus, semilogplot, setcolors, setoptions, setoptions3d, spacecurve, sparsematrixplot, surfdata, textplot, textplot3d, tubeplot]

(2)

``

``

 

 

h := proc (x) options operator, arrow; piecewise(x <= 2000000, 1, 2000000 < x, 1.701*10^25/x^4) end proc;

proc (x) options operator, arrow; piecewise(x <= 2000000, 1, 2000000 < x, 1.701*10000000000000000000000000/((x^4))) end proc

(3)

 

 

j := proc (x) options operator, arrow; piecewise(0 <= x and x <= 4.6*10^2, 1, 4.6*10^2 < x and x <= 5.6*10^7, 10/x^(3/8), 5.6*10^7 < x, 9.8*10^28/x^4) end proc; 1; y := proc (x) options operator, arrow; piecewise(x) end proc

proc (x) options operator, arrow; piecewise(0 <= x and x <= 4.6*100, 1, 4.6*100 < x and x <= 5.6*10000000, 10/x^(3/8), 5.6*10000000 < x, 9.8*10000000000000000000000000000/((x^4))) end proc

 

proc (x) options operator, arrow; piecewise(x) end proc

(4)

with(plots); 1; loglogplot(j(x), x = 0 .. 7*10^7, thickness = 1)

[animate, animate3d, animatecurve, arrow, changecoords, complexplot, complexplot3d, conformal, conformal3d, contourplot, contourplot3d, coordplot, coordplot3d, densityplot, display, dualaxisplot, fieldplot, fieldplot3d, gradplot, gradplot3d, implicitplot, implicitplot3d, inequal, interactive, interactiveparams, intersectplot, listcontplot, listcontplot3d, listdensityplot, listplot, listplot3d, loglogplot, logplot, matrixplot, multiple, odeplot, pareto, plotcompare, pointplot, pointplot3d, polarplot, polygonplot, polygonplot3d, polyhedra_supported, polyhedraplot, rootlocus, semilogplot, setcolors, setoptions, setoptions3d, spacecurve, sparsematrixplot, surfdata, textplot, textplot3d, tubeplot]

 

 

loglogplot(h(x), x = 0 .. 10^8, thickness = 2)

 

``

``



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?

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