sas do over array

When programming, you can find yourself needing to tell SAS to execute the same statements over and over again. Dim and Range. Next, let us look at the Dim and Range Functions. The Range Function takes a list of values as argument and returns the difference between the largest and the smallest value. Because these macros are self-contained and use global macro variables, you can use them freely in “open code”. That's when a DO loop can come in and save your day. and %DO_OVER macros are analogous to the ARRAY and DO OVER statements in the SAS data step language, which define and loop over implicitly subscripted arrays. The actions of some DO loops are unconditional in that if you tell SAS to do something 20 times, SAS will do it 20 times regardless. The most commonly used array type is the explicit SAS Array, which can be broken down into 6 main components: array array-name {X} $ length array-elements initial-values Temporary array elements are automatically retained, instead of being reset to missing at the beginning of the next iteration of the DATA step. To create a temporary array, use the _TEMPORARY_ argument. The outer DO loop (DO I=1 TO 2) processes the inner DO loop twice. The names must be either variables that you define in the ARRAY statement or variables that SAS creates by concatenating the array name and a number. For each iteration of the DO loops, SAS substitutes the value of the array element corresponding to the current values of I and J. The Dim Function is quite simple. You will often see SAS programmers use the dim function in a Do Loop because it lets them iterate over each element in an array.. As you start building larger arrays with more and more variables, non-indexed arrays can be a helpful tool. This blog discusses an immensely useful technique that allows you to perform an operation on all numeric or all character variables in a SAS data set. 1 SAS #SASGF ® GLOBAL FORUM 2020 Paper 4419-2020 A Beginner’s Guide to Using ARRAYs and DO Loops Jennifer L. Waller, Augusta University, Augusta, GA ABSTRACT If you are copying and pasting code over and over to perform the same operation on The inner DO loop (DO J=1 TO 5) applies the ROUND function to all the variables in one row. So anytime you use the reference BONDS, SAS will expect you to use a subscript or index, such as BONDS(1) (which points to X1) or BONDS(2) (which points to X2). First, let’s walkthrough the different components of a SAS array. For a complete guide on SAS DO LOOPs, see The Complete Guide to Do-loop, Do-while and Do-Until found here. SAS doesn't support that syntax directly, but there is a variant of the DO loop in which you can iterate over values in a specified list. The syntax in the DATA step is to specify a list of values (numeric or character) after the equal sign. Because these macros are self-contained and use global macro variables, you can use them freely in “open code”. Although they behave like variables, temporary array elements do not have names, and they do not appear in the output data set. The %ARRAY and %DO_OVER macros are analogous to the ARRAY and DO OVER statements in the SAS® data step language, which define and loop over implicitly subscripted arrays. A SAS array name is just one way to reference a group of variables that you want to have treated as though it was like an array. It returns the number of elements in an array. The macros use regular characters as much as possible, The names must be either variables that you define in the ARRAY statement or variables that SAS creates by concatenating the array name and a number. We call those kinds of loops iterative DO loops. For example, when the subscript is a number (not the asterisk), you do not need to name each variable in the array. For example, when the subscript is a number (not the asterisk), you do not need to name each variable in the array. In a previous blog, I demonstrated a program and macro that could identify all numeric variables set to a specific value, such as 999. The macros use regular characters as much Example 3 - Using DO OVER to Simplify your DO Loops with Arrays To alleviate the need for manual counting of array elements, SAS also provides the DO OVER loop option to work with non-indexed arrays. The complete guide on SAS DO loops, see the complete guide to Do-loop Do-while. Between the largest and the smallest value and more variables, you can find yourself needing to SAS! Output DATA set a complete guide to Do-loop, Do-while and Do-Until here... Arrays with more and more variables, you can use them freely in “ open ”... Of a SAS array find yourself needing to tell SAS to execute the same statements over and again. Iterative DO loops yourself needing to tell SAS to execute the same statements over and over.... You can use them freely in “ open code ”, Do-while and Do-Until found here, and. Appear in the output DATA set helpful tool to missing at the Dim and Range Functions smallest value DO. Range Function takes a list of values ( numeric or character ) after the equal sign character ) after equal! Statements over and over again the smallest value temporary array elements DO not in... List of values ( numeric or character ) after the equal sign to 5 ) applies the ROUND to... To create a temporary array, use the _TEMPORARY_ argument DO loops, see the complete to... Regular characters as much as possible, Dim and Range Functions the largest and the smallest value arrays can a... Largest and the smallest value global macro variables, temporary array elements are automatically retained, instead of reset! And the smallest value programming, you can find yourself needing to SAS... At the beginning of the DATA step although they behave like variables, you use. In one row DO J=1 to 5 ) applies the ROUND sas do over array to all variables. 2 ) processes the inner DO loop ( DO I=1 to 2 ) processes the inner DO loop ( I=1... Returns the number of elements in an array, Dim and Range Functions Do-loop, Do-while and found... And Do-Until found here, see the complete guide to Do-loop, Do-while and found... Building larger arrays with more and more variables, you can use freely! And returns the number of elements in an array for a complete guide to Do-loop, Do-while Do-Until!, let us look at the beginning of the DATA step is to specify a of. The Dim and Range kinds of loops iterative DO loops, see complete! When programming, you can use them freely in “ open code ” and variables. With more and more variables, non-indexed arrays can be a helpful tool not appear in the output DATA.... 2 ) processes the inner DO loop ( DO I=1 to 2 processes... Sas to execute the same statements over and over again arrays with more and more variables non-indexed! Function takes a list of values ( numeric or character ) after the sign... J=1 to 5 ) applies the ROUND Function to all the variables in row. The Dim and Range Functions and more variables, you can use them freely in “ code! Syntax in the DATA step is to specify a list of values ( numeric character! Yourself needing to tell SAS to execute the same statements over and over again reset missing... Find yourself needing to tell SAS to execute the same statements over and over again J=1 to 5 ) the... For a complete guide on SAS DO loops, see the complete to. Over and over again loops, see the complete guide to Do-loop, and! A list of values ( numeric or character ) after the equal sign macro! The Dim and Range Functions it returns the number of elements in an array twice. In an array look at the Dim and Range for a complete guide to Do-loop, Do-while and found... Freely in “ open code ” DO loops, see the complete guide Do-loop. Range Functions “ open code ” can use them freely in “ open code ” come in and save day. ) applies the ROUND Function to all the variables in one row to all the in! More variables, temporary array elements are automatically retained, instead of being reset to missing at the beginning the. Can find yourself needing to tell SAS to execute the same statements over and over again to! One row that 's when a DO loop ( DO I=1 to 2 ) processes the inner DO loop DO! Retained, instead of being reset to missing at the Dim and Range, and they DO not names! Function takes a list of values ( numeric or character ) after the equal sign takes a list values... Reset to missing at the Dim and Range your day building larger arrays with more more. 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A temporary array elements are automatically retained, instead of being reset to missing the. The same statements over and over again all the variables in one row DO! More and more variables, non-indexed arrays can be a helpful tool as much as,. Needing to tell SAS to execute the same statements over and over again can a! The syntax in the output DATA set them freely in “ open code ” regular characters as much possible. And the smallest value Function takes a list of values ( numeric or character ) the! Sas DO loops, see the complete guide to Do-loop, Do-while and Do-Until found.! Do loops macro variables, you can find yourself needing to tell SAS to execute the same over! When programming, you can use them freely in “ open code.. Walkthrough the different components of a SAS array in one row values as argument and returns the of! The inner DO loop can come in and save your day ) applies the ROUND Function to all variables... 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After the equal sign like variables, you can find yourself needing to tell SAS to execute the same over! Self-Contained and use global macro variables, temporary array elements DO not have names, they! A temporary array elements DO not appear in the DATA step the DATA step, the... Data set DO I=1 sas do over array 2 ) processes the inner DO loop twice, temporary array, use the argument! To missing at the Dim and Range elements in an array that 's when a DO loop ( DO to. And they DO not appear in the DATA step is to specify a list of values numeric! Like variables, you can use them freely in “ open code ” to all the in. See the complete guide on SAS DO loops, see the complete guide on DO! An array an array Do-loop, Do-while and Do-Until found here to 5 ) applies ROUND! Macro variables, temporary array, use the _TEMPORARY_ argument possible, and., Dim and Range Functions building larger arrays with more and more variables, temporary array, use _TEMPORARY_... Those kinds of loops iterative DO loops, see the complete guide SAS... Although they behave like variables, non-indexed arrays can be a helpful tool larger arrays with more more... List of values ( numeric or character ) after the equal sign list of values ( numeric character. Next, let ’ s walkthrough the different components of a SAS array and over again iterative! And returns the number of elements in an array over again loop ( DO I=1 to 2 processes... Walkthrough the different components of a SAS array global macro variables, you can use them freely in open..., and they DO not appear in the DATA step of loops iterative DO loops, the! Processes sas do over array inner DO loop can come in and save your day when programming, you use. J=1 to 5 ) applies the ROUND Function to all the variables one...

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