```Date: Sep 15, 2013 7:00 AM
Author: Bob Hanlon
Subject: Re: multiintegral and table

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}]7/12f2[x_, y_, Q_] = Integrate[2*y + x^2*Q, {x, 0, 1}, {y, 0, x}]1/3 + Q/4ftotal[x_, y_, Q_] = f1[x, y] + f2[x, y, Q]11/12 + Q/4dataxx = Table[{Q, ftotal[x, y, Q]}, {Q, 0, 10, 1/400}];ListPlot[dataxx]Your function ftotal lends itself to using much sparser data samplingdataxx2 = 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 HanlonOn 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>>
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