Problem 42798. Moving Product (Easy)

Created by Peng Liu

Solve Later

{"relationships":[{"relationshipType":"http://schemas.mathworks.com/matlab/code/2013/relationships/document","targetMode":"","relationshipId":"rId1","target":"/matlab/document.xml"},{"relationshipType":"http://schemas.mathworks.com/matlab/code/2013/relationships/output","targetMode":"","relationshipId":"rId2","target":"/matlab/output.xml"}],"parts":[{"partUri":"/matlab/document.xml","relationship":[],"contentType":"application/vnd.mathworks.matlab.code.document+xml","content":"<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<w:document xmlns:w=\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\"><w:body><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>Given an input array A, write a function</w:t></w:r><w:r><w:t> </w:t></w:r><w:r><w:rPr><w:b/></w:rPr><w:t>movprod(A,k,dim)</w:t></w:r><w:r><w:t> to calculate the moving product over a sliding window of length</w:t></w:r><w:r><w:t> </w:t></w:r><w:r><w:rPr><w:b/></w:rPr><w:t>k</w:t></w:r><w:r><w:t> along the specified dimension</w:t></w:r><w:r><w:t> </w:t></w:r><w:r><w:rPr><w:b/></w:rPr><w:t>dim</w:t></w:r><w:r><w:t> of input array</w:t></w:r><w:r><w:t> </w:t></w:r><w:r><w:rPr><w:b/></w:rPr><w:t>A</w:t></w:r><w:r><w:t>. If dim is omitted, operate along the first non-singleton dimension of A.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>Example 1:</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"code\"/></w:pPr><w:r><w:t><![CDATA[ >> A = [1 2 3 4 5 6];\n >> B = movprod(A,3)\n B = \n 6 24 60 120]]></w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>Example 2:</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"code\"/></w:pPr><w:r><w:t><![CDATA[ >> A = [1 4 3 6 2\n 2 5 1 2 3\n 3 6 2 3 5];\n >> B = movprod(A,3,2)\n B = \n 12 72 36\n 10 10 6\n 36 36 30]]></w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>You may assume that dim &lt;= 3, and the input array A is a non-empty array with size(A,dim) &gt;= k.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>Related problems:</w:t></w:r><w:r><w:t> </w:t></w:r><w:hyperlink w:docLocation=\"http://www.mathworks.com/matlabcentral/cody/problems/429-function-on-a-moving-window\"><w:r><w:t>Problem 429</w:t></w:r></w:hyperlink><w:r><w:t>;</w:t></w:r><w:r><w:t> </w:t></w:r><w:hyperlink w:docLocation=\"http://www.mathworks.com/matlabcentral/cody/problems/246-project-euler-problem-8-find-largest-product-in-a-large-string-of-numbers\"><w:r><w:t>Problem 246</w:t></w:r></w:hyperlink></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:rPr><w:b/></w:rPr><w:t>A kind note</w:t></w:r><w:r><w:t> (05/15/2017): This problem was created in 2016, one year before R2017a's introduction of the built-in movprod. To avoid function name clash, we've changed the user-defined function name into</w:t></w:r><w:r><w:t> </w:t></w:r><w:r><w:rPr><w:b/></w:rPr><w:t>moveprod</w:t></w:r><w:r><w:t> in the test-suite, which gives you the opportunity to solve the problem by directly calling the built-in movprod!</w:t></w:r></w:p></w:body></w:document>"},{"partUri":"/matlab/output.xml","contentType":"text/xml","content":"<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\" ?><embeddedOutputs><metaData><evaluationState>manual</evaluationState><layoutState>code</layoutState><outputStatus>ready</outputStatus></metaData><outputArray type=\"array\"/><regionArray type=\"array\"/></embeddedOutputs>"}]}

Given an input array A, write a function movprod(A,k,dim) to calculate the moving product over a sliding window of length k along the specified dimension dim of input array A. If dim is omitted, operate along the first non-singleton dimension of A.Example 1:<pre> &gt;&gt; A = [1 2 3 4 5 6];
 &gt;&gt; B = movprod(A,3)
 B = 
 6 24 60 120</pre>Example 2:<pre> &gt;&gt; A = [1 4 3 6 2
 2 5 1 2 3
 3 6 2 3 5];
 &gt;&gt; B = movprod(A,3,2)
 B = 
 12 72 36
 10 10 6
 36 36 30</pre>You may assume that dim &lt;= 3, and the input array A is a non-empty array with size(A,dim) &gt;= k.Related problems: <a href = "http://www.mathworks.com/matlabcentral/cody/problems/429-function-on-a-moving-window">Problem 429</a>; <a href = "http://www.mathworks.com/matlabcentral/cody/problems/246-project-euler-problem-8-find-largest-product-in-a-large-string-of-numbers">Problem 246</a>A kind note (05/15/2017): This problem was created in 2016, one year before R2017a's introduction of the built-in movprod. To avoid function name clash, we've changed the user-defined function name into moveprod in the test-suite, which gives you the opportunity to solve the problem by directly calling the built-in movprod!

Given an input array A, write a function *movprod(A,k,dim)* to calculate the moving product over a sliding window of length *k* along the specified dimension *dim* of input array *A*. If dim is omitted, operate along the first non-singleton dimension of A.

Example 1:

>> A = [1 2 3 4 5 6];
    >> B = movprod(A,3)
    B = 
       6   24   60   120

Example 2:

>> A = [1     4     3    6    2
            2     5     1    2    3
            3     6     2    3    5];
    >> B = movprod(A,3,2)
    B = 
        12   72   36
        10   10    6
        36   36   30

You may assume that dim <= 3, and the input array A is a non-empty array with size(A,dim) >= k.

Related problems: <http://www.mathworks.com/matlabcentral/cody/problems/429-function-on-a-moving-window Problem 429>; <http://www.mathworks.com/matlabcentral/cody/problems/246-project-euler-problem-8-find-largest-product-in-a-large-string-of-numbers Problem 246>

*A kind note* (05/15/2017): This problem was created in 2016, one year before R2017a's introduction of the built-in movprod. To avoid function name clash, we've changed the user-defined function name into *moveprod* in the test-suite, which gives you the opportunity to solve the problem by directly calling the built-in movprod!

Solve

Solution Stats

162 Solutions
29 Solvers

Last Solution submitted on Mar 07, 2022

Last 200 Solutions

Problem Comments

Problem Recent Solvers29

Problem Tags

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Problem 42798. Moving Product (Easy)

Solution Stats

Last 200 Solutions

Problem Comments

Problem Recent Solvers29

Suggested Problems

More from this Author29

Problem Tags

Community Treasure Hunt

Problem 42798. Moving Product (Easy)

Solution Stats

Last 200 Solutions

Problem Comments

Problem Recent Solvers29

Suggested Problems

More from this Author29

Problem Tags

Community Treasure Hunt

Players