how to plot 3-d using surf(xyu) where -1<x1, -1<y<1.

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dave
dave 2014-2-24
评论： dave 2014-2-25
PROGRAM Jacobi_method
IMPLICIT NONE
! Declare Variables
Real, allocatable :: x(:),y(:),u(:,:), v(:,:),u_old(:,:)
Real:: xy,h,Smax,tolerence,error
Integer:: i,j,JI
Print *, 'Enter the space size:'
read*, xy
Print*, 'Enter the final space:'
read*, Smax
h=Smax/xy !The size of spacestep
Print*, 'This gives stepsize of space h=',h
error = 1.d0
tolerence = 10E-4
JI = 20 ! Total number of space stepsize
allocate (x(0:JI),y(0:JI),u(0:JI+1,0:JI+1),v(0:JI+1,0:JI+1),u_old(0:JI+1,0:JI+1))
open(10,file='Jacobi_method.m')
!Initial Conditions
x(0)= -1.0
x(JI)= 1.0
y(0)= -1.0
y(JI)= 1.0
do i=0,JI
do j=0,JI
x(i)= -1 + i*h ! x-axix
y(j)= -1 + j*h ! y-axis
u(i,j)= 0 ! Entire Boundary is zero
end do
end do
while (error .GT. tolerence) do ! To stop
do i=1, JI-1
do j=1,JI-1
u_old(i,j)= u(i,j) ! To store the old values
!Using 5-point scheme Formulae and rearranging the equation
v(i,j)= 0.25*(u(i+1,j)+u(i,j+1)+u(i-1,j)+u(i,j-1)+h**2)
end do
end do
do i=1, JI-1
do j=1, JI-1
u(i,j)= v(i,j) ! Giving the new values
end do
end do
error =0.d0 ! Now, error reading the value of zero
do i=1,JI-1
do j=1, JI-1
error = error + abs(u(i,j)- u_old(i,j)) ! To Stop
end do
end do
end do
!Print out the Approximate solution in matlab to get output and plot
write(10,*) 'xyu =['
do i=0, JI
do j=0,JI
write(10,*) y(j),x(i),u(i,j)
end do
end do
write(10,*) ']'
write(10,*) " surf(xyu)" !Ploting diagram x,y,u
write(10,*) "xlabel('x'),ylabel('y'),legend('Approximate Jacobi Scheme')"
close(10)
END PROGRAM Jacobi_method
Note: This is fortran code to generate output and plot the graphs in the matlab. There are no errors in fortran code and i can generate the outputs of u(i,j) between but -1<x<1 and -1<y<1 . I want to plot the graph of u(i,j) between -1<x<1 and -1<y<1 in the matlab but the plots is not properly working between -1 to 1 in both x-axis and y-axis.
To answer my question: you can look out the code after this (!Print out the Approximate solution in matlab to get output and plot) which is code for the matlab.
To make it clear, here is the output i want to plot generate by fortran code into matlab:
xyu =[ x-axis y-axis u(i,j)
-1.00000 -1.00000 0.00000
-0.900000 -1.00000 0.00000
-0.800000 -1.00000 0.00000
-0.700000 -1.00000 0.00000
-0.600000 -1.00000 0.00000
-0.500000 -1.00000 0.00000
-0.400000 -1.00000 0.00000
-0.300000 -1.00000 0.00000
-0.200000 -1.00000 0.00000
-9.999999E-02 -1.00000 0.00000
1.490116E-08 -1.00000 0.00000
0.100000 -1.00000 0.00000
0.200000 -1.00000 0.00000
0.300000 -1.00000 0.00000
0.400000 -1.00000 0.00000
0.500000 -1.00000 0.00000
0.600000 -1.00000 0.00000
0.700000 -1.00000 0.00000
0.800000 -1.00000 0.00000
0.900000 -1.00000 0.00000
1.00000 -1.00000 0.00000
-1.00000 -0.900000 0.00000
-0.900000 -0.900000 1.723304E-02
-0.800000 -0.900000 2.946638E-02
-0.700000 -0.900000 3.867569E-02
-0.600000 -0.900000 4.578741E-02
-0.500000 -0.900000 5.130390E-02
-0.400000 -0.900000 5.552766E-02
-0.300000 -0.900000 5.865262E-02
-0.200000 -0.900000 6.080576E-02
-9.999999E-02 -0.900000 6.206776E-02
1.490116E-08 -0.900000 6.248359E-02
0.100000 -0.900000 6.206776E-02
0.200000 -0.900000 6.080576E-02
0.300000 -0.900000 5.865262E-02
0.400000 -0.900000 5.552766E-02
0.500000 -0.900000 5.130390E-02
0.600000 -0.900000 4.578741E-02
0.700000 -0.900000 3.867569E-02
0.800000 -0.900000 2.946638E-02
0.900000 -0.900000 1.723304E-02
1.00000 -0.900000 0.00000
-1.00000 -0.800000 0.00000
-0.900000 -0.800000 2.946638E-02
-0.800000 -0.800000 5.195795E-02
-0.700000 -0.800000 6.945068E-02
-0.600000 -0.800000 8.317228E-02
-0.500000 -0.800000 9.390321E-02
-0.400000 -0.800000 0.102157
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-0.200000 -0.800000 0.112506
-9.999999E-02 -0.800000 0.114985
1.490116E-08 -0.800000 0.115803
0.100000 -0.800000 0.114985
0.200000 -0.800000 0.112506
0.300000 -0.800000 0.108280
0.400000 -0.800000 0.102157
0.500000 -0.800000 9.390321E-02
0.600000 -0.800000 8.317228E-02
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0.100000 -0.700000 0.159572
0.200000 -0.700000 0.155961
0.300000 -0.700000 0.149812
0.400000 -0.700000 0.140923
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0.600000 -0.700000 0.113552
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0.900000 -0.700000 3.867569E-02
1.00000 -0.700000 0.00000
-1.00000 -0.600000 0.00000
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-0.800000 -0.600000 8.317228E-02
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-0.500000 -0.600000 0.157568
-0.400000 -0.600000 0.172748
-0.300000 -0.600000 0.184095
-0.200000 -0.600000 0.191962
-9.999999E-02 -0.600000 0.196590
1.490116E-08 -0.600000 0.198118
0.100000 -0.600000 0.196590
0.200000 -0.600000 0.191962
0.300000 -0.600000 0.184095
0.400000 -0.600000 0.172748
0.500000 -0.600000 0.157568
0.600000 -0.600000 0.138058
0.700000 -0.600000 0.113552
0.800000 -0.600000 8.317228E-02
0.900000 -0.600000 4.578741E-02
1.00000 -0.600000 0.00000
-1.00000 -0.500000 0.00000
-0.900000 -0.500000 5.130390E-02
-0.800000 -0.500000 9.390321E-02
-0.700000 -0.500000 0.128985
-0.600000 -0.500000 0.157568
-0.500000 -0.500000 0.180491
-0.400000 -0.500000 0.198419
-0.300000 -0.500000 0.211868
-0.200000 -0.500000 0.221216
-9.999999E-02 -0.500000 0.226723
1.490116E-08 -0.500000 0.228542
0.100000 -0.500000 0.226723
0.200000 -0.500000 0.221216
0.300000 -0.500000 0.211868
0.400000 -0.500000 0.198419
0.500000 -0.500000 0.180491
0.600000 -0.500000 0.157568
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-0.500000 -0.300000 0.211868
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0.500000 -0.300000 0.211868
0.600000 -0.300000 0.184095
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-0.600000 -0.200000 0.191962
-0.500000 -0.200000 0.221216
-0.400000 -0.200000 0.244326
-0.300000 -0.200000 0.261789
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-9.999999E-02 -0.200000 0.281200
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0.100000 -0.200000 0.281200
0.200000 -0.200000 0.273989
0.300000 -0.200000 0.261789
0.400000 -0.200000 0.244326
0.500000 -0.200000 0.221216
0.600000 -0.200000 0.191962
0.700000 -0.200000 0.155961
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0.100000 0.100000 0.288655
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0.300000 0.100000 0.268593
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1.490116E-08 1.00000 0.00000
0.100000 1.00000 0.00000
0.200000 1.00000 0.00000
0.300000 1.00000 0.00000
0.400000 1.00000 0.00000
0.500000 1.00000 0.00000
0.600000 1.00000 0.00000
0.700000 1.00000 0.00000
0.800000 1.00000 0.00000
0.900000 1.00000 0.00000
1.00000 1.00000 0.00000
]

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采纳的回答

Walter Roberson
Walter Roberson 2014-2-24
It is easier not to generate xyu like that. Instead, output x, then output y, then output u. Then on the MATLAB side,
surf(x, y, reshape(u, length(x), length(y)) )
For this to work properly, when you output u, output it down the columns rather than across the rows. Or output it in matrix form with multiple columns per line.
  1 个评论
dave
dave 2014-2-25
Thank you very much. I have used contour(x, y, reshape(u, length(x), length(y)) ) and the graph is coming even better.

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