Problem 1999. Bleed non-zeros to the right using REGEXP, and that sort of cheatcodess...

Created by J-G van der Toorn

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>This one is quite similar to</w:t></w:r><w:r><w:t> </w:t></w:r><w:hyperlink w:docLocation=\"http://www.mathworks.nl/matlabcentral/cody/problems/1998-bleed-non-zeros-to-the-right\"><w:r><w:t>http://www.mathworks.nl/matlabcentral/cody/problems/1998-bleed-non-zeros-to-the-right</w:t></w:r></w:hyperlink><w:r><w:t>.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>But this time you are allowed to use regexp, regexprep, and regexpi. In fact, you are encouraged to do so, since I expect creative solutions, using dynamic regular expressions (</w:t></w:r><w:r><w:t> </w:t></w:r><w:hyperlink w:docLocation=\"http://www.mathworks.nl/help/matlab/matlab_prog/dynamic-regular-expressions.html\"><w:r><w:t>http://www.mathworks.nl/help/matlab/matlab_prog/dynamic-regular-expressions.html</w:t></w:r></w:hyperlink><w:r><w:t> ).</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>You get a vector, some values and a lot of zeroes. Every zero is replaced by the first non-zero element to its left.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>For example, </w:t></w:r><w:r><w:t> </w:t></w:r><w:r><w:rPr><w:rFonts w:cs=\"monospace\"/></w:rPr><w:t>[1 0 0 2 0]</w:t></w:r><w:r><w:t> becomes</w:t></w:r><w:r><w:t> </w:t></w:r><w:r><w:rPr><w:rFonts w:cs=\"monospace\"/></w:rPr><w:t>[1 1 1 2 2]</w:t></w:r><w:r><w:t> and</w:t></w:r><w:r><w:t> </w:t></w:r><w:r><w:rPr><w:rFonts w:cs=\"monospace\"/></w:rPr><w:t>[0 0 -12 13 0 i 0 -i 76.54321 0 0]</w:t></w:r><w:r><w:t> becomes</w:t></w:r><w:r><w:t> </w:t></w:r><w:r><w:rPr><w:rFonts w:cs=\"monospace\"/></w:rPr><w:t>[0 0 -12 13 13 i i -i 76.54321 76.54321 76.54321]</w:t></w:r><w:r><w:t>.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>Is it even easier now, or not? Still,</w:t></w:r><w:r><w:t> </w:t></w:r><w:r><w:rPr><w:rFonts w:cs=\"monospace\"/></w:rPr><w:t>eval</w:t></w:r><w:r><w:t> and friends are forbidden.</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

26 Solutions
15 Solvers

Last Solution submitted on Oct 21, 2020

Last 200 Solutions

Problem Recent Solvers15

Problem Tags

dynamic regular expressions vector

Community Treasure Hunt

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

Start Hunting!

Problem 1999. Bleed non-zeros to the right using REGEXP, and that sort of cheatcodess...

Solution Stats

Last 200 Solutions

Problem Recent Solvers15

Suggested Problems

More from this Author31

Problem Tags

Community Treasure Hunt

Problem 1999. Bleed non-zeros to the right using REGEXP, and that sort of cheatcodess...

Solution Stats

Last 200 Solutions

Problem Recent Solvers15

Suggested Problems

More from this Author31

Problem Tags

Community Treasure Hunt

Players