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Originally posted by adder8810 at 2011-04-11 01:04:46:
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adder8810

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Originally posted by xiegangmai at 2011-04-11 07:36:08:
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xianggui7895

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matlabºÃÏñûÓÐÌṩ¸üºÃµÄ½â¾ö°ì·¨£¬ÄãÓк¯Êýf(x)£¬ÏÈÉ趨YÖµ£¬·´º¯ÊýÇóx£¬È»ºócylinder(x)£¿£¿
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Originally posted by adder8810 at 2011-04-11 10:18:50:
MatlabÖÐÊÇ·ñÓÐÏֳɵĺ¯Êý¿ÉÒÔµ÷Óã¿
ÁíÍ⣬ÎÒµÄÎÊÌâÆäʵ²»ÊǺܸ´ÔÓ£¬ÄÜÈÆxÖá»òÕßyÖáÐýת¾ÍÐУ¬Ö»ÊÇÏë¸Ä±äϵͳĬÈϵÄÖáµ½ÓëÖ®´¹Ö±µÄÖáÉÏ£¿

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CODE:
clear
x = 0 : pi / 10 : 2 * pi;   % x·¶Î§
y = 2 + cos( x );   % y = f( x );

[ X, Y, Z ] = cylinder( y, 20 );    % »Ø×ªÖÐÐÄÊÇzÖá

subplot( 1, 3, 1 )  % ÈÆzÖáÐýת
surf( X, Y, Z )
xlabel( 'x' )
ylabel( 'y' )
zlabel( 'z' )
axis square

Sx = reshape( X, size( X, 1 ) * size( X, 2 ), 1 );
Sy = reshape( Y, size( Y, 1 ) * size( Y, 2 ), 1 );
Sz = reshape( Z, size( Z, 1 ) * size( Z, 2 ), 1 );

subplot( 1, 3, 2 ) % ½«»Ø×ªÖÐÐÄÓÉzÖáתµ½xÖᣬÐèÈÆyÖáÐýת90¶È
theta = pi / 2;
% ͼÐα任¾ØÕó
M = [ cos( theta ), 0, -sin( theta );
    0, 1, 0;
    sin( theta ), 0, cos( theta ) ];

S1 = [ Sx, Sy, Sz ] * M;
X1 = reshape( S1( :, 1 ), size( X, 1 ), size( X, 2 ) );
Y1 = reshape( S1( :, 2 ), size( X, 1 ), size( X, 2 ) );
Z1 = reshape( S1( :, 3 ), size( X, 1 ), size( X, 2 ) );

surf( X1, Y1, Z1 )
xlabel( 'x' )
ylabel( 'y' )
zlabel( 'z' )
axis square



subplot( 1, 3, 3 )  % ½«»Ø×ªÖÐÐÄÓÉzÖáתµ½yÖᣬÐèÈÆxÖáÐýת-90¶È
theta = -pi / 2;
% ͼÐα任¾ØÕó
M = [ 1, 0, 0;
    0, cos( theta ), sin( theta );
    0, -sin( theta ), cos( theta ) ];

S2 = [ Sx, Sy, Sz ] * M;
X2 = reshape( S2( :, 1 ), size( X, 1 ), size( X, 2 ) );
Y2 = reshape( S2( :, 2 ), size( X, 1 ), size( X, 2 ) );
Z2 = reshape( S2( :, 3 ), size( X, 1 ), size( X, 2 ) );
surf( X2, Y2, Z2 )
xlabel( 'x' )
ylabel( 'y' )
zlabel( 'z' )
axis square

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adder8810

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xiegangmai

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Originally posted by adder8810 at 2011-04-11 15:15:04:
ÒòΪÎÒÕâ¸öÏ൱ÓÚÓÉÒ»¸ö¶þάº¯Êý¾­¹ýÐýת±ä³ÉÒ»¸öÈýάÐýת¶Ô³ÆµÄÐÎ×´¡£ÄÇôÔڱ任ǰ£¬Õâ¸ö¶þάº¯ÊýÈÆÊ²Ã´ÖáÐýת¾ÍÊǹؼü£¬Ö᲻ͬ£¬ÐýתµÄÇúÃæ¾ÍÍêÈ«²»Í¬¡£
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CODE:
function [ sx, sy, sz ] = mycylinder( x, y, ax )
% ½«x, yת³ÉÁÐÏòÁ¿
x = x(:);
y = y(:);
z = zeros( size( x ) );
dtheta = pi / 100;
sx = zeros( length( x ), 201 );
sy = zeros( length( x ), 201 );
sz = zeros( length( x ), 201 );
switch ax
    case 'x'
        for i = 1 : 200
            theta = i * dtheta;
            M = [ 1, 0, 0; 0, cos( theta ), sin( theta ); 0, -sin( theta ), cos( theta ) ];
            S = [ x, y, z ] * M;
            sx( :, i ) = S( :, 1 );
            sy( :, i ) = S( :, 2 );
            sz( :, i ) = S( :, 3 );
            
        end
        sx( :, end ) = sx( :, 1 );
        sy( :, end ) = sy( :, 1 );
        sz( :, end ) = sz( :, 1 );
    case 'y'
        for i = 1 : 200
            theta = i * dtheta;
            M = [ cos( theta ), 0, -sin( theta ); 0, 1, 0; sin( theta ), 0, cos( theta ) ];
            S = [ x, y, z ] * M;
            sx( :, i ) = S( :, 1 );
            sy( :, i ) = S( :, 2 );
            sz( :, i ) = S( :, 3 );
            
        end
        sx( :, end ) = sx( :, 1 );
        sy( :, end ) = sy( :, 1 );
        sz( :, end ) = sz( :, 1 );
end

²âÊÔÀý1£º
CODE:
clear
clc
x = 0 : pi / 100 : 2 * pi;   % x·¶Î§
y = 2 + cos( x );   % y = f( x );
subplot( 1, 3, 1 )
plot( x, y );
xlabel( 'x' )
ylabel( 'y' )

[ sx1, sy1, sz1 ] = mycylinder( x, y, 'x' );
subplot( 1, 3, 2)
surf( sx1, sy1, sz1 );
xlabel( 'x' )
ylabel( 'y' )
zlabel( 'z' )

[ sx2, sy2, sz2 ] = mycylinder( x, y, 'y' );
subplot( 1, 3, 3 )
surf( sx2, sy2, sz2 );
xlabel( 'x' )
ylabel( 'y' )
zlabel( 'z' )

½á¹û£º

²âÊÔÀý2£º
CODE:
clear
clc
x = 0 : pi / 100 : 2 * pi;   % x·¶Î§
y = 2 + x .^ 2;   % y = f( x );
subplot( 1, 3, 1 )
plot( x, y );
xlabel( 'x' )
ylabel( 'y' )

[ sx1, sy1, sz1 ] = mycylinder( x, y, 'x' );
subplot( 1, 3, 2)
surf( sx1, sy1, sz1 );
xlabel( 'x' )
ylabel( 'y' )
zlabel( 'z' )

[ sx2, sy2, sz2 ] = mycylinder( x, y, 'y' );
subplot( 1, 3, 3 )
surf( sx2, sy2, sz2 );
xlabel( 'x' )
ylabel( 'y' )
zlabel( 'z' )

½á¹û£º


Äã¿´¿´ÊDz»ÊÇÐèÒªµÄ½á¹û¡£mycylinderº¯Êý»¹ÐèÍêÉÆ¡£

°´µÚÒ»ÖÖ·½Ê½£¬½«ÇúÏßÑØy = x¶Ô³ÆÒ»Ï£¬ÓÃcylinder×ö¸ü·½±ã¡£

[ Last edited by xiegangmai on 2011-4-11 at 20:57 ]

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adder8810

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meimeijia

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9Â¥2011-04-12 11:14:59
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scn6767

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595754Â¥: Originally posted by xiegangmai at 2011-04-11 20:56:25
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