Problem 44357. Back to basics: throwing errors / exceptions

Created by David Verrelli

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{"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:rPr><w:b/></w:rPr><w:t>Throwing and handling errors (or exceptions) is an important part of practical programming.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>Here your task is to provide an alternative to the built in elementwise division operator</w:t></w:r><w:r><w:t> </w:t></w:r><w:r><w:rPr><w:b/></w:rPr><w:t>./</w:t></w:r><w:r><w:t> (equivalent to the</w:t></w:r><w:r><w:t> </w:t></w:r><w:hyperlink w:docLocation=\"http://au.mathworks.com/help/fixedpoint/ref/rdivide.html\"><w:r><w:t>rdivide</w:t></w:r></w:hyperlink><w:r><w:t> function) with the following differences:</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"ListParagraph\"/><w:numPr><w:numId w:val=\"2\"/></w:numPr></w:pPr><w:r><w:t>throws an error if</w:t></w:r><w:r><w:t> </w:t></w:r><w:r><w:rPr><w:i/></w:rPr><w:t>any</w:t></w:r><w:r><w:t> of the input elements have a non-zero</w:t></w:r><w:r><w:t> </w:t></w:r><w:hyperlink w:docLocation=\"https://en.wikipedia.org/wiki/Imaginary_number\"><w:r><w:t>imaginary component</w:t></w:r></w:hyperlink><w:r><w:t> (and are therefore 'complex numbers' that are incapable of being correctly represented as real numbers);</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"ListParagraph\"/><w:numPr><w:numId w:val=\"2\"/></w:numPr></w:pPr><w:r><w:t>throws an error if</w:t></w:r><w:r><w:t> </w:t></w:r><w:r><w:rPr><w:i/></w:rPr><w:t>any</w:t></w:r><w:r><w:t> of the input elements are</w:t></w:r><w:r><w:t> </w:t></w:r><w:hyperlink w:docLocation=\"http://au.mathworks.com/help/matlab/ref/char.html\"><w:r><w:t>character arrays</w:t></w:r></w:hyperlink><w:r><w:t>;</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"ListParagraph\"/><w:numPr><w:numId w:val=\"2\"/></w:numPr></w:pPr><w:r><w:t>yields</w:t></w:r><w:r><w:t> </w:t></w:r><w:hyperlink w:docLocation=\"http://au.mathworks.com/help/matlab/ref/nan.html\"><w:r><w:t>NaN</w:t></w:r></w:hyperlink><w:r><w:t> wherever the divisor (i.e. the denominator) is equal to zero.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>This concept is analogous to the built in MATLAB function</w:t></w:r><w:r><w:t> </w:t></w:r><w:hyperlink w:docLocation=\"http://au.mathworks.com/help/matlab/ref/realsqrt.html\"><w:r><w:t>\"realsqrt\"</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>The first error must generate an MException with the following properties: identifier = 'realDivision:complexInput', message = 'The realDivision function only operates on real inputs.'.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>The second error must generate an MException with the following properties: identifier = 'realDivision:incompatibleInput', message = 'The realDivision function is not defined for character inputs.'.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>All other behaviour should be identical to the mrdivide function. Any exceptions that would have been thrown by mrdivide should also be thrown by your function — with the same contents of the identifier and message fields.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>Note that the difference in MATLAB between</w:t></w:r><w:r><w:t> </w:t></w:r><w:hyperlink w:docLocation=\"http://au.mathworks.com/help/matlab/ref/error.html\"><w:r><w:t>errors</w:t></w:r></w:hyperlink><w:r><w:t> and</w:t></w:r><w:r><w:t> </w:t></w:r><w:hyperlink w:docLocation=\"http://au.mathworks.com/help/matlab/ref/mexception-class.html\"><w:r><w:t>exceptions</w:t></w:r></w:hyperlink><w:r><w:t> is</w:t></w:r><w:r><w:t> </w:t></w:r><w:hyperlink w:docLocation=\"https://au.mathworks.com/matlabcentral/answers/116197-there-seems-to-be-two-different-methods-of-error-handling-in-matlab-error-handling-and-exception\"><w:r><w:t>somewhat fraught</w:t></w:r></w:hyperlink><w:r><w:t>.</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>"}]}

Throwing and handling errors (or exceptions) is an important part of practical programming.Here your task is to provide an alternative to the built in elementwise division operator ./ (equivalent to the <a href = "http://au.mathworks.com/help/fixedpoint/ref/rdivide.html">rdivide</a> function) with the following differences:<ol><li>throws an error if any of the input elements have a non-zero <a href = "https://en.wikipedia.org/wiki/Imaginary_number">imaginary component</a> (and are therefore 'complex numbers' that are incapable of being correctly represented as real numbers);</li><li>throws an error if any of the input elements are <a href = "http://au.mathworks.com/help/matlab/ref/char.html">character arrays</a>;</li><li>yields <a href = "http://au.mathworks.com/help/matlab/ref/nan.html">NaN</a> wherever the divisor (i.e. the denominator) is equal to zero.</li></ol>This concept is analogous to the built in MATLAB function <a href = "http://au.mathworks.com/help/matlab/ref/realsqrt.html">"realsqrt"</a>.The first error must generate an MException with the following properties: identifier = 'realDivision:complexInput', message = 'The realDivision function only operates on real inputs.'.The second error must generate an MException with the following properties: identifier = 'realDivision:incompatibleInput', message = 'The realDivision function is not defined for character inputs.'.All other behaviour should be identical to the mrdivide function. Any exceptions that would have been thrown by mrdivide should also be thrown by your function — with the same contents of the identifier and message fields.Note that the difference in MATLAB between <a href = "http://au.mathworks.com/help/matlab/ref/error.html">errors</a> and <a href = "http://au.mathworks.com/help/matlab/ref/mexception-class.html">exceptions</a> is <a href = "https://au.mathworks.com/matlabcentral/answers/116197-there-seems-to-be-two-different-methods-of-error-handling-in-matlab-error-handling-and-exception">somewhat fraught</a>.

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Problem 44357. Back to basics: throwing errors / exceptions

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