Dot product: Difference between revisions
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Walterpachl (talk | contribs) (→{{header|REXX}}: fefurbished and dropped np error checking) |
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=={{header|REXX}}== |
=={{header|REXX}}== |
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With error checking |
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<syntaxhighlight lang="rexx">/*REXX program |
<syntaxhighlight lang="rexx">/*REXX program computes the dot product of two equal size vectors (of any size).*/ |
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vectorA = ' 1 3 -5 ' /*populate vector A with some numbers*/ |
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vectorB = ' 4 -2 -1 ' /* " " B " " " */ |
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Say 'vector A =' vectorA /*display the elements of vector A. */ |
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Say 'vector B =' vectorB /* " " " " " B. */ |
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p= |
p=dot_product(vectorA,vectorB) /*invoke function & compute dot product*/ |
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Say /*display a blank line for readability.*/ |
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Say 'dot product =' p /*display the dot product */ |
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Exit /*stick a fork in it, we're all done. */ |
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/*------------------------------------------------------------------------------*/ |
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/*──────────────────────────────────────────────────────────────────────────────────────*/ |
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dot_product: /* compute the dot product */ |
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Parse Arg A,B |
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/* Begin Error Checking */ |
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If words(A)<>words(B) Then |
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$=$+word(A,j) * word(B,j) /* ··· and add the product to the sum.*/ |
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Call exit 'Vectors aren''t the same size:' words(A) '<>' words(B) |
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end /*j*/ |
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Do i=1 To words(A) |
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return $ /*return the sum to function's invoker.*/</syntaxhighlight> |
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If datatype(word(A,i))<>'NUM' Then |
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Call exit 'Element' i 'of vector A isn''t a number:' word(A,i) |
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If datatype(word(B,i))<>'NUM' Then |
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Call exit 'Element' i 'of vector B isn''t a number:' word(B,i) |
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End |
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Do i=1 To words(A) |
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product=product+word(A,i)*word(B,i) /*multiply corresponding numbers */ |
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End |
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Return product |
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exit: |
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Say '***error***' arg(1) |
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Exit 13 |
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</syntaxhighlight> |
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'''output''' using the default (internal) inputs: |
'''output''' using the default (internal) inputs: |
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<pre> |
<pre> |
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vector B = 4 -2 -1 |
vector B = 4 -2 -1 |
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dot product = 3 |
dot product = 3</pre> |
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</pre> |
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===with error checking=== |
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<syntaxhighlight lang="rexx">/*REXX program computes the dot product of two equal size vectors (of any size).*/ |
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vectorA = ' 1 3 -5 ' /*populate vector A with some numbers*/ |
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say 'vector A = ' vectorA /*display the elements in the vector A.*/ |
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say 'vector B = ' vectorB /* " " " " " " B.*/ |
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p=.prod(vectorA, vectorB) /*invoke function & compute dot product*/ |
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say /*display a blank line for readability.*/ |
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say 'dot product = ' p /*display the dot product to terminal. */ |
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exit /*stick a fork in it, we're all done. */ |
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/*──────────────────────────────────────────────────────────────────────────────────────*/ |
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.prod: procedure; parse arg A,B /*this function compute the dot product*/ |
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lenA = words(A); @.1= 'A' /*the number of numbers in vector A. */ |
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lenB = words(B); @.2= 'B' /* " " " " " " B. */ |
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/*Also, define 2 literals to hold names*/ |
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if lenA\==lenB then do; say "***error*** vectors aren't the same size:" /*oops*/ |
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say ' vector A length = ' lenA |
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say ' vector B length = ' lenB |
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exit 13 /*exit pgm with bad─boy return code 13.*/ |
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end |
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$=0 /*initialize the sum to 0 (zero). */ |
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do j=1 for lenA /*multiply each number in the vectors. */ |
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#.1=word(A,j) /*use array to hold 2 numbers at a time*/ |
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#.2=word(B,j) |
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do k=1 for 2; if datatype(#.k,'N') then iterate |
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say "***error*** vector " @.k ' element' j, |
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" isn't numeric: " n.k; exit 13 |
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end /*k*/ |
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$=$ + #.1 * #.2 /* ··· and add the product to the sum.*/ |
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end /*j*/ |
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return $ /*return the sum to function's invoker.*/</syntaxhighlight> |
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'''output''' is the same as the 1<sup>st</sup> REXX version. <br><br> |
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=={{header|Ring}}== |
=={{header|Ring}}== |
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