if-statement

Putting an if-elif-else statement on one line?

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I have read the links below, but it doesn’t address my question. Does Python have a ternary conditional operator? (the question is about condensing if-else statement to one line) Is there an easier way of writing an if-elif-else statement so it fits on one line? For example, if expression1: statement1 elif expression2: statement2 else: statement3 … Read more

What is the effect of ordering if…else if statements by probability?

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Specifically, if I have a series of if…else if statements, and I somehow know beforehand the relative probability that each statement will evaluate to true, how much difference in execution time does it make to sort them in order of probability? For example, should I prefer this: if (highly_likely) //do something else if (somewhat_likely) //do … Read more

Bash if statement with multiple conditions throws an error

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I’m trying to write a script that will check two error flags, and in case one flag (or both) are changed it’ll echo– error happened. My script: my_error_flag=0 my_error_flag_o=0 do something….. if [[ “$my_error_flag”==”1” || “$my_error_flag_o”==”2” ] || [ “$my_error_flag”=”1” && “$my_error_flag_o”=”2” ]]; then echo “$my_error_flag” else echo “no flag” fi Basically, it should be, … Read more

How to implement if-else statement in XSLT?

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I am trying to implement an if -else statement in XSLT but my code just doesn’t parse. Does anyone have any ideas? <xsl:variable name=”CreatedDate” select=”@createDate”/> <xsl:variable name=”IDAppendedDate” select=”2012-01-01″ /> <b>date: <xsl:value-of select=”$CreatedDate”/></b> <xsl:if test=”$CreatedDate > $IDAppendedDate”> <h2> mooooooooooooo </h2> </xsl:if> <xsl:else> <h2> dooooooooooooo </h2> </xsl:else> 5 Answers 5

How to prevent ifelse() from turning Date objects into numeric objects

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I am using the function ifelse() to manipulate a date vector. I expected the result to be of class Date, and was surprised to get a numeric vector instead. Here is an example: dates <- as.Date(c(‘2011-01-01’, ‘2011-01-02’, ‘2011-01-03’, ‘2011-01-04’, ‘2011-01-05’)) dates <- ifelse(dates == ‘2011-01-01’, dates – 1, dates) str(dates) This is especially surprising because … Read more