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Question: why do i get inconsistent plot with the same expression,just by changing the define domain?

Question:why do i get inconsistent plot with the same expression,just by changing the define domain?

memdream 15 Maple 2017
plot accuracy domain
June 07 2017
2

hi, learners of maple like me, i was handling a project,but i came across this problem,and i began to doubt the accuracy of maple-plot,,,

very simply expression,result3,changing with the parameter f,

i first plot the f from 100 to 5000,

than i need to watch closer,

so i change the define domain of parameter f, plot f from 100 to 1000,  

and the result of plot definitely  differs from the previous one. 

a low vally in the first figure (f in the scale of 100-1000),disappears! that's insane...

 

you can see below,

anyone see it, can you give me some clue? i really do not understand this. why ,why why,,

result3 := 3.269235506947450*10^11*sqrt(-1/(0.975698207102e-3*cos(0.19042716640833e-1*f)^2*cos(0.9521358320417e-2*f)^4-0.975698207102e-3*cos(0.19042716640833e-1*f)^2*cos(0.9521358320417e-2*f)^2+5.099915851388520*10^(-8)*cos(0.9521358320417e-2*f)^4-5.099915851388520*10^(-8)*cos(0.9521358320417e-2*f)^2+1.311634114532540*10^12*sin(0.19042716640833e-1*f)*sin(0.9521358320417e-2*f)*cos(0.9521358320417e-2*f)*cos(0.19042716640833e-1*f)+4.405792916762340*10^26*cos(0.19042716640833e-1*f)^2-4.406861706842330*10^26))

326923550694.745*(-1/(0.975698207102e-3*cos(0.19042716640833e-1*f)^2*cos(0.9521358320417e-2*f)^4-0.975698207102e-3*cos(0.19042716640833e-1*f)^2*cos(0.9521358320417e-2*f)^2+0.509991585138852e-7*cos(0.9521358320417e-2*f)^4-0.509991585138852e-7*cos(0.9521358320417e-2*f)^2+1311634114532.54*sin(0.19042716640833e-1*f)*sin(0.9521358320417e-2*f)*cos(0.9521358320417e-2*f)*cos(0.19042716640833e-1*f)+0.440579291676234e27*cos(0.19042716640833e-1*f)^2-0.440686170684233e27))^(1/2)

 (1)

plot(result3, f = 100 .. 5000);

  

 

plot(result3, f = 100 .. 1000);

  

 

 

``


 

Download test.mw

 

 

 
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