Problem 651. Functional inputs

Created by Alex Feinman

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>Return an n-dimensional array whose elements are the results of a function over a set of vectors.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>The (i,j,k, ...n)th element of the output matrix is the results of executing the function on the ith element of the first vector, jth element of the second, and so forth. The function will be passed in, accepts n arguments, and returns a single number.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>For example, if the function is:</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"code\"/></w:pPr><w:r><w:t><![CDATA[    minus12 = @(a) a(1)-a(2);]]></w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>and the inputs are:</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"code\"/></w:pPr><w:r><w:t><![CDATA[    as = [1 3 5 7];\n    bs = [0 1 2 3 4];]]></w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>then the output would be:</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"code\"/></w:pPr><w:r><w:t><![CDATA[    >> gridit(minus12, as, bs)\n    ans =\n           1  0 -1 -2 -3\n           3  2  1  0 -1\n           5  4  3  2  1\n           7  6  5  4  3]]></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

67 Solutions
17 Solvers

Last Solution submitted on May 23, 2022

Last 200 Solutions

Problem Comments

2 Comments

2 Comments

Alex Feinman on 2 May 2012

I'd like to include the test case listed below, but I'm stumped as to why it doesn't work:

%%
x1 = [ 1 2 3 ]
x2 = [ 10 20 ]
y_correct = [9 19; 8 18; 7 17]
y_actual = gridit(@minus, x1, x2);
assert(isequal(y_actual, y_correct));

Venu Lolla on 2 May 2012

Alex, I believe it is because the 'minus' function requires two input arguments. The test cases and the example use functions that accept a single input argument. Hope that helps.

Solution Comments

Show comments

Problem Recent Solvers17

Problem Tags

Community Treasure Hunt

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

Start Hunting!

Problem 651. Functional inputs

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers17

Suggested Problems

More from this Author3

Problem Tags

Community Treasure Hunt

Problem 651. Functional inputs

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers17

Suggested Problems

More from this Author3

Problem Tags

Community Treasure Hunt

Players

WeChat