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mehdi jafari

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12 years, 96 days
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These are questions asked by mehdi jafari

why this integral does not return anythi...

mehdi jafari 774
integration
July 29 2014
0 5


``

> 

restart:
> 

l := 16; m := .75; EIy := 0.2e5; EIz := 0.400e7; GJ := 0.1e5; mj := .1; Pz := 5000;

16

  

.75

  

0.2e5

  

0.400e7

  

0.1e5

  

.1

  

5000

 (1)
> 

eq1 := m*(diff(diff(w(x, t), t), t))+diff(diff(EIy*(diff(diff(w(x, t), x), x))+(EIz-EIy)*(diff(diff(w(x, t), x), x))*(theta(x)+phi(x, t))^2, x), x)-Pz = 0;

.75*(diff(diff(w(x, t), t), t))+0.2e5*(diff(diff(diff(diff(w(x, t), x), x), x), x))+0.398e7*(diff(diff(diff(diff(w(x, t), x), x), x), x))*(theta(x)+phi(x, t))^2+0.1592e8*(diff(diff(diff(w(x, t), x), x), x))*(theta(x)+phi(x, t))*(diff(theta(x), x)+diff(phi(x, t), x))+0.796e7*(diff(diff(w(x, t), x), x))*(diff(theta(x), x)+diff(phi(x, t), x))^2+0.796e7*(diff(diff(w(x, t), x), x))*(theta(x)+phi(x, t))*(diff(diff(theta(x), x), x)+diff(diff(phi(x, t), x), x))-5000 = 0

 (2)
> 

w := unapply(q[1](t)*cosh(1.8751*x/l),x, t);

proc (x, t) options operator, arrow; q[1](t)*cosh(.1171937500*x) end proc

 (3)
> 

theta := proc (x) options operator, arrow; 0 end proc;

proc (x) options operator, arrow; 0 end proc

 (4)
> 

#theta(x);eq1;
> 

phi := unapply(q[4](t)*sin(1.5708*x/l),x, t);

proc (x, t) options operator, arrow; q[4](t)*sin(0.9817500000e-1*x) end proc

 (5)
> 

eq2:=unapply(lhs(eq1),x,t);

proc (x, t) options operator, arrow; .75*(diff(diff(q[1](t), t), t))*cosh(.1171937500*x)+3.772661154*q[1](t)*cosh(.1171937500*x)-302.9569534*q[1](t)*cosh(.1171937500*x)*q[4](t)^2*sin(0.9817500000e-1*x)^2+2515.691179*q[1](t)*sinh(.1171937500*x)*q[4](t)^2*sin(0.9817500000e-1*x)*cos(0.9817500000e-1*x)+1053.716523*q[1](t)*cosh(.1171937500*x)*q[4](t)^2*cos(0.9817500000e-1*x)^2-5000 end proc

 (6)
> 

f[1] := int(expand(eq2(x,t)*cosh(1.8751*x/l)), x = 0 .. l);

int(.75*(diff(diff(q[1](t), t), t))*cosh(.1171937500*x)^2+3.772661154*q[1](t)*cosh(.1171937500*x)^2-302.9569534*q[1](t)*cosh(.1171937500*x)^2*q[4](t)^2*sin(0.9817500000e-1*x)^2+2515.691179*cosh(.1171937500*x)*q[1](t)*sinh(.1171937500*x)*q[4](t)^2*sin(0.9817500000e-1*x)*cos(0.9817500000e-1*x)+1053.716523*q[1](t)*cosh(.1171937500*x)^2*q[4](t)^2*cos(0.9817500000e-1*x)^2-5000*cosh(.1171937500*x), x = 0 .. 16)

 (7)
> 

 

> 

 

``


Download 1.mw

problem with integrations, bug in maple ...

mehdi jafari 774
integral
July 13 2014
6 0

can i compute this integral so that the answer does not have any complex part ? i just want the integral returns me real function or number .
 i also use evalf(int ... ) and evalf(Int ... ) and two different answers were given ! what is wrong ?
tnx for help in advance .

> 

restart:
> 

int(log(sec(x)+ tan(x)),x);

-I*ln(exp(I*x))*ln((-I*(exp(I*x))^2+I+2*exp(I*x))/((exp(I*x))^2+1))+(1/2)*Pi*ln(-I*(exp(I*x)-I))+I*dilog(-I*exp(I*x))+I*dilog(-I*(I+exp(I*x)))+I*ln(exp(I*x))*ln(-I*(I+exp(I*x)))

 (1)
> 

evalf(Int(log(sec(x)+ tan(x)),x=0..10));

3.493589070+16.61151993*I

 (2)
> 

evalf(int(log(sec(x)+ tan(x)),x=0..10));

7.035851984+23.35343547*I

 (3)
> 

 

 

Download integral.mw

convert data readed from text file to ar...

mehdi jafari 774
array convert
July 12 2014
1 3

i have read data from a text file. i want to convert this data to array,how should i do that ?

for example :
 i have readed these files and i want convert them to array which for the first one,has 3 rows and 4 columns.
what should i do ?

> 

restart:
> 

FileTools[Text][ReadFile]("NLIST.txt");

" 1 0.00000000000 0.00000000000 0.00000000000 2 50.0000000000 0.00000000000 0.00000000000 3 25.0000000000 0.00000000000 0.00000000000 "

 (1)
> 

op(FileTools[Text][ReadFile]("ELIST.txt"));

" 1 1 1 1 0 1 1 3 0 2 1 1 1 0 1 3 2 0 "

 (2)
> 

 

NULL


Download convert_to_array.mw   ELIST.txt  NLIST.txt

why maple does not have break point in l...

mehdi jafari 774
loop
June 22 2014
0 6

matlab has break point in loops which in extremely useful tool for finding errors in long term loops,whay maple does not has sth similiar !?

Maple , Matlab or Mathematica ? which on...

mehdi jafari 774
June 22 2014
4 10

hi every one,i want to know what are the maple strentgh compraed to matlab and mathematica ? why someone should choose maple instead of these both ? i searched the net,but nothing useful has been found , tnx in advance .

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