Problem 45882. Matrix indexing with two vectors of indices (★★)

Created by Anirban Pal

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>(copy of Prob 589)</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>Given a matrix M and two index vectors a and b, return a row vector x where x(i) = M(a(i),b(i)). Thus, if</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 5 ]\nb = [ 4 5 2 ]\n\nM = [   17   24    1    8   15;\n        23    5    7   14   16;\n         4    6   13   20   22;\n        10   12   19   21    3;\n        11   18   25    2    9 ]]]></w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>then</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"code\"/></w:pPr><w:r><w:t><![CDATA[x = [ M(1,4) M(2,5) M(5,2) ]\nx = [ 8 16 18 ]]]></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>"}]}

Solve

Solution Stats

20 Solutions
14 Solvers

Last Solution submitted on Sep 20, 2020

Last 200 Solutions

Problem Recent Solvers14

Problem Tags

matrix indexing

Problem 45882. Matrix indexing with two vectors of indices (★★)

Solution Stats

Last 200 Solutions

Problem Recent Solvers14

Suggested Problems

More from this Author42

Problem Tags

Problem 45882. Matrix indexing with two vectors of indices (★★)

Solution Stats

Last 200 Solutions

Problem Recent Solvers14

Suggested Problems

More from this Author42

Problem Tags

Players