Advanced Search

mehdi jafari

754 Reputation

13 Badges

11 years, 167 days
Contact mehdi jafari

MaplePrimes Activity


These are replies submitted by mehdi jafari

Xstar...

mehdi jafari 754
August 12 2016
0 0

@Preben Alsholm tnx for your help and answer .


actually Z and R are different directions and thus indendepnt parameters,

Xstar is a paramatere dependet to Boundary Y 
from the last BC we conclude :
Y(T,1)=(Xstar)^n -> Xstar=Y(T,1)^(1/n) .

can not solve this problem using maple ?! what is th idea for solving this problem with and witouth maple !?

example...

mehdi jafari 754
July 21 2015
0 0

@Carl Love for example ( not surely correct example ) i say if -0.12a<a<0.08  and -0.44<c<-0.02 and b in sth like them, how many inervals can be found for my three variables that my answers are real ? the varibale are allowed to vary between -1 and 1 , but what are the intervals for each varibale that in those intervals,the answers are real ?
how many intervals exist in which the result is real ? can we find group of intervals for each varibale that in those intervals the answers are real ? for example
group one ={ <a< , <b< , <c< } -> the answers are real 

group two = { .... } sth like this, -> the answers are real  

and ....
what are the groups of intervals in which the answers are real .

find the intervals in which results are ...

mehdi jafari 754
July 21 2015
0 0

@acer @Carl Love can i find the exact intervals of each variable for which it has real answer ?
the varibale can change between -1 and 1 , but what are intervals for each varibale for which the answer is real ? how many intervals are there for the vrabiles for which the answer in them are surely real ?

please correct and specify the variables...

mehdi jafari 754
March 18 2015
0 0

please change e to exp() and specify the varibales, are your variables theta[1](t) or theta[1] ?
please make correction about the varibales . and then speciify the equation which are going to be solved simultaneously. after all . u can use the command like this : 
dsolve( {eq[1],eq[2],eq[3]});
or after correction , please upload your new sheet again.

thnx...

mehdi jafari 754
March 09 2015
0 0

@Kitonum it is exactly what i needed

what is your problem exactly ?...

mehdi jafari 754
March 09 2015
0 0

what is your problem exactly ? post your mw code so that we can help

nooo...

mehdi jafari 754
July 29 2014
0 0

@Axel Vogt as u can see,the integration has not been solved , ! i want the integration with respect to x, to be solved. in your answers,there is no x, but in mine there are . whay i can not do that , what is your maple version ?

are u sure ?...

mehdi jafari 754
July 29 2014
0 0

@Axel Vogt this does not answere in my question ! :( 

 

NULL

> 

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] := value(expand(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)
> 

expand(eq2(x,t)*cosh(1.8751*x/l)):
> 

Int(%, x = 0 .. l);
> 

expand(%);
> 

value(%);
> 

 

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)

  

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)

  

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)

 (8)
> 

 

> 

 

NULL

 

Download 1.mw

what do u mean by plot in term of 1/x?...

mehdi jafari 754
July 26 2014
0 0

f(x)=x^2= 1/(1/x)^2 , thus what does this plot will have that the other one won't ?

yess,...

mehdi jafari 754
July 15 2014
0 0

@Preben Alsholm but now it is optional, and u should subscribe for receiving email notifications.

i have tried sth like this...

mehdi jafari 754
July 12 2014
0 0

i have tried sth like this, but it has some problems, for example for an unkown number of rows and columns,i should update Matrix dimensions ! but i do not know them. i want the code be general .


> 

restart:
> 

M:=Matrix(2,9):N:=Matrix(3,4):
> 

file1:="ELIST.txt":fclose(file1);
> 

file2:="NLIST.txt":fclose(file2);
> 

for i from 1 to 2 do
> 

M[i]:=(fscanf(file1,"%{9}fr")[1]);
> 

od:
> 

for i from 1 to 3 do
> 

N[i]:=(fscanf(file2,"%{4}fr")[1]);
> 

od:
> 

N;M;

Matrix(3, 4, {(1, 1) = 1., (1, 2) = 0., (1, 3) = 0., (1, 4) = 0., (2, 1) = 2., (2, 2) = 50., (2, 3) = 0., (2, 4) = 0., (3, 1) = 3., (3, 2) = 25., (3, 3) = 0., (3, 4) = 0.})

  

Matrix(2, 9, {(1, 1) = 1., (1, 2) = 1., (1, 3) = 1., (1, 4) = 1., (1, 5) = 0., (1, 6) = 1., (1, 7) = 1., (1, 8) = 3., (1, 9) = 0., (2, 1) = 2., (2, 2) = 1., (2, 3) = 1., (2, 4) = 1., (2, 5) = 0., (2, 6) = 1., (2, 7) = 3., (2, 8) = 2., (2, 9) = 0.})

 (1)

``


Download matrix.mw

actually this does not worked !...

mehdi jafari 754
July 12 2014
0 0

@Mac Dude it only imports one row ! not more !

> 

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)
> 

M:=ImportMatrix("NLIST.txt", source=delimited, datatype=float, delimiter=" ");

Error, (in ImportMatrix) end of input encountered while reading Matrix

  
> 

M:=ImportMatrix("NLIST.txt", source=delimited, datatype=float);

M := Matrix(5, 1, {(1, 1) = 1., (2, 1) = 0., (3, 1) = 0., (4, 1) = 0., (5, 1) = 2.})

 (3)
> 

 

``


Download convert_to_array.mw

please insert your original question her...

mehdi jafari 754
July 02 2014
0 0

@schloemilch please insert your original question here, and maybe i can help u and upload a working version !
actually i do not know u can not use these. until u insert your worksheet here. tnx

some explanations...

mehdi jafari 754
July 02 2014
0 0


> 

restart:
> 

df1:=a-y(x)=diff(y(x),x)*bc;

a-y(x) = (diff(y(x), x))*bc

 (1)
> 

dsolve(df1);

y(x) = a+exp(-x/bc)*_C1

 (2)
> 

df2:=diff(y(x),x)*bc-a+y(x);

(diff(y(x), x))*bc-a+y(x)

 (3)
> 

dsolve(df2);

y(x) = a+exp(-x/bc)*_C1

 (4)
> 

# do u think there is a difference between a=c and a-c=0 ? and according to one theorem in differential equation,if y1 and y2 are two answer to an ODE,c1*y1+c2*y2 is also an answer ! so if y(x) is an answer,-y(x) is also an answer,please note that _C1 is a constant number and u can assume _C2= - (_C1) .
> 

 


Download dsolve.mw

you are very welcome...

mehdi jafari 754
July 01 2014
0 0

@wo0olf maybe u want to notice Mr.Kitonum's suggestion about your input correctness.

khahesh mikonam aga, deggat kon bebin oun 1/1 boode ya 1/() kolle ebarat bode? good luck.

5 6 7 8 9 10 11 Last Page 7 of 23