
Re: multiintegral and table
Posted:
Sep 15, 2013 7:00 AM


You cannot use _ (represents Blank[ ] ) in a variable or function name.
f1[x_, y_] = Integrate[2*y + x^2, {x, 0, 1}, {y, 0, x}]
7/12
f2[x_, y_, Q_] = Integrate[2*y + x^2*Q, {x, 0, 1}, {y, 0, x}]
1/3 + Q/4
ftotal[x_, y_, Q_] = f1[x, y] + f2[x, y, Q]
11/12 + Q/4
dataxx = Table[{Q, ftotal[x, y, Q]}, {Q, 0, 10, 1/400}];
ListPlot[dataxx]
Your function ftotal lends itself to using much sparser data sampling
dataxx2 = Table[{Q, ftotal[x, y, Q]}, {Q, 0, 10, 5}]
{{0, 11/12}, {5, 13/6}, {10, 41/12}}
ListPlot[dataxx2, Joined > True, PlotStyle > Thick]
ListLinePlot[dataxx2, PlotStyle > Thick]
Bob Hanlon
On Sat, Sep 14, 2013 at 6:03 AM, Parada Hutauruk <phutauruk@gmail.com>wrote:
> Dear all, > > I have a function > > f_1 [x_,y_] = Integrate[2*y + x^2, {x,0,1},{y,0,x}] > > f_2 [x_,y_,Q_] = Integrate[2*y +x^2*Q, {x,0,1},{y,0,x}] > > f_total [x_,y_,Q_] = f_1[x,y] + f_2[x,y,Q] > > Then I want to plot the f total using table with Q start from 0 to 10 with > increment 0.0025. > > I have defined by > > dataxx = Table[{Q,f_total[x,y,Q]}, {Q, 0,10, 0.0025}] > > And Plot the data on the table by > > ListPlot[dataxx] > > But when I evaluate the function, it took a long time and the plot is not > yielded. Could anyone help me please to find the bug? I really appreciate > for help. > > Thanks, > PTPH > >

