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https://issues.apache.org/jira/browse/SYSTEMML-260?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Deron Eriksson closed SYSTEMML-260.
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> Can't specify a linefeed character when printing to console
> -----------------------------------------------------------
>
> Key: SYSTEMML-260
> URL: https://issues.apache.org/jira/browse/SYSTEMML-260
> Project: SystemML
> Issue Type: Improvement
> Components: APIs
> Reporter: Deron Eriksson
> Assignee: Niketan Pansare
> Priority: Minor
>
> When trying to figure out DML and PyDML code, it is very useful to print
> information to the console (using the print() function). Currently, it does
> not appear possible to be able to output a linefeed character.
> For example, the following DML:
> {code}x=1
> y=2
> print('x:' + x + '\ny:' + y)
> print('x:' + x + '\\ny:' + y){code}
> produces:
> {code}x:1\ny:2
> x:1\\ny:2{code}
> This becomes more of an issue as the complexity of what is being looked at
> increases.
> For example, here a function returning a string displaying the values in a
> matrix is called and the results are printed to the console.
> {code}matrixVals = function(matrix[double] mat) return (string str){
> str = '';
> for (i in 1:nrow(mat)) {
> str = str + '| '
> for (j in 1:ncol(mat)) {
> n = mat[i,j]
> str = str + as.scalar(n) + ' | '
> }
> str = str + '\n'
> }
> }
> m = matrix("1 2 3 4 5 6 7 8 9 10 11 12", rows=4, cols=3)
> vals = matrixVals(m)
> print(vals){code}
> The printed string is:
> {code}| 1.0 | 2.0 | 3.0 | \n| 4.0 | 5.0 | 6.0 | \n| 7.0 | 8.0 | 9.0 | \n|
> 10.0 | 11.0 | 12.0 | \n{code}
> Being able to output a linefeed character can assist DML/PyDML creators when
> figuring out their scripts.
> Note: it's possible to output a linefeed by actually having a linefeed in the
> string, but this produces code that is difficult to manage.
> {code}x=1
> y=2
> print('x:' + x + '
> y:' + y){code}
> produces:
> {code}x:1
> y:2{code}
> So, it would be nice to be able to recognize either \n or a double
> backslashed n as a linefeed.
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