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Vector products: Difference between revisions
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→{{header|REXX}}: ordered subroutines in alphabetical order, removed blank lines, added whitespace, changed comments. -- ~~~~
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m (→{{header|REXX}}: ordered subroutines in alphabetical order, removed blank lines, added whitespace, changed comments. -- ~~~~) |
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=={{header|REXX}}==
▲/*REXX program to compute the products: the dot product, */
/* the cross product, */
/* the scalar triple product, and*/
/* the vector triple product. */
a = 3 4 5
b = 4 3 5
c = "-5 -12 -13"
call tellV 'vector A =',a /*show the A vector, aligned #s*/
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call tellV 'scalar triple product [A∙(BxC)] =',dot(a,cross(b,c))
call tellV 'vector triple product [Ax(BxC)] =',cross(a,cross(b,c))
exit /*stick a fork in it, we're done.*/
/*─────────────────────────────────────cross subroutine─────────────────*/▼
cross: procedure; parse arg x1 x2 x3,y1 y2 y3 /*the CROSS product.*/▼
return x2*y3-x3*y2 x3*y1-x1*y3 x1*y2-x2*y1 /*a vector quantity.*/▼
/*─────────────────────────────────────dot subroutine───────────────────*/▼
dot: procedure; parse arg x1 x2 x3,y1 y2 y3 /*the DOT product.*/▼
return x1*y1 + x2*y2 + x3*y3 /*a scaler quantity.*/▼
/*─────────────────────────────────────tellV subroutine─────────────────*/
tellV: procedure; parse arg name,x y z /*display the vector*/
w=max(4,length(x),length(y),length(z)) /*max width of nums.*/
say right(name,40) right(x,w) right(y,w) right(z,w)
return</lang>
'''out0ut'''
▲/*─────────────────────────────────────dot subroutine───────────────────*/
▲dot: procedure; parse arg x1 x2 x3,y1 y2 y3 /*the DOT product.*/
▲ return x1*y1 + x2*y2 + x3*y3 /*a scaler quantity.*/
▲/*─────────────────────────────────────cross subroutine─────────────────*/
▲cross: procedure; parse arg x1 x2 x3,y1 y2 y3 /*the CROSS product.*/
▲ return x2*y3-x3*y2 x3*y1-x1*y3 x1*y2-x2*y1 /*a vector quantity.*/
<pre style="height:25ex;overflow:scroll">
vector A = 3 4 5
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