The do statement, the simplest form of do group processing, designates a group of statements to be executed as a unit, usually as a part of ifthenelse statements. Given below is the general form of a do loop statements in sas. How to increment a macro do loop by a noninteger value. The syntax in the data step is to specify a list of values numeric or character after the equal sign. A beginners guide to arrays and do loops jennifer l. This macro currently works for windows platforms, but could be modified for other operating environments. The complete guide to doloop, dowhile and dountil do you often need to execute the same statements over and over again in your sas programs. The sas statements are repeatedly executed until the final value of the index variable is.
For each file, i have used a %let to name the file in a macro variable, and a %include to bring it to the current sas session as the following. The do until statement executes statements in a do loop repetitively until a condition is true. Nested do loop in sas posted 06122014 44 views in reply to munitech4u. Here you can learn how to incorporate loops to reduce repetitive code in sas. The sasiml language is a matrixvector language, so statements that operate on a few long vectors run much faster than equivalent statements that involve many scalar quantities. I know r isnt all that great for variable recoding but is there a way to do this with do loops. This course is part of a series by the sas institute, designed to prepare you for the sas 9. The statements between the do and end statements are called a do group. But not sure how to let the nested loop use array of x1x81. Although most sas data step programmers have made use of do loops and arrays, few take full advantage of the power and flexibility of these tools.
For details, see the sas documentation for your operating environment. Usually doing it separately is more code but since this is a theoretical discussion its difficult to say. To have sas do the counting, put a in the brackets instead of the number of elements. This macro lists all files within the directory that is passed to the macro including any subdirectories. Generating repetitive pieces of text using %do loops. Importing multiple excel sheets with a macro loop sas. This example will not run if you use the lockdown system option. The complete guide to doloop, do while and do until do you often need to execute the same statements over and over again in your sas programs. Select variables to transpose with the var statement. But when you want the same set of statements to be executed again and again, we need the help of loops.
The memory capabilities of your system can limit the number of nested do statements you can use. Import all csv files that exist within a directory. As a general rule, if you find yourself programming a macro loop that calls the same procedure many times, you should ask yourself whether. Sas do index loop this do index loop uses a index variable for its start and end value. Hey there, so ive been spinning my wheels at this for way too long that i feel like there must be a better way.
Use the libname statement to importexport an excel file with xlsx engine. How to prepare for the exam requirements and details requirements to complete examples in this book, you must have access to sas windowing environment, sas enterprise guide, or sas studio. Proc import combined with % do loop to read in the data from multiple excel worksheets. The do statement is the simplest form of do group processing. Do loops can not be used here since the label statement is a declarative statement. I would like to iterate through files in a particular folder, and extract substrings of their files names. Avoid unnecessary loops in the sasiml language i have some advice on using do loops in sasiml language. Process data using do loops explain how iterative do loops function. The do until statement executes statements in a do loop repetitively until a condition is true, checking the condition after each iteration of the do loop. Exporting to multiple pdf files in a loop by appen. For details, see the sas documentation about how many levels of. Extracting data from pdf files nat wooding, dominion virginia power, richmond, virginia abstract the adobe portable document file pdf format has become a popular means of producing documents for use on other computers when the author cannot be certain of the software available on the other machines. A sas macro to combine portrait and landscape rtf files into one single file. As i have written, macro loops that call a procedure hundreds or thousands of time are relatively slow.
The iterative do statement executes a group of statements repetitively based on the value of an index variable. Using do loops there are four forms of the do statement. Using do loop to import excel files posted 05252017 2641 views in reply to vannesslee datastep to create the loop, call execute to generate one proc import and either a dataset set or proc append for each value in the given range. A beginners guide to arrays and do loops sas institute. I tried to use nested do loop by using 2 loops 1 for p1p9 and another for s1s9. There are many variations of the do statement and these can be used in. The sas statements are repeatedly executed until the while condition becomes false. This implementation of the macro %doloop works perfectly fine, except in the situations when we need to use it within a dataproc step. I have an excel workbook that i have assigned a libname and i would like to do formatting on the sheets which are labeled in a way that i thought would be conducive to set up a loop. An easy way to run thousands of regressions in sas the. Is it possible to moverename files in git and maintain their history.
Waller, augusta university, augusta, ga abstract if you are copying and pasting code over and over to perform the same operation on multiple variables in a sas data step you need to learn about arrays and do loops. Im trying to create this macro to append a few files from this year, but ideally it would span across multiple years. Using do loop to import excel files sas support communities. A sas macro to automate importing excel worksheets into sas data. Sas do while loop this do while loop uses a while condition.
Sas macro do loop import multiple flat files stack. Winnt, and win95, use an operating system pipe to obtain a list of files in the directory in a form that the sas system uses in an infileinput. Browse other questions tagged sas rename sasmacro doloops or ask your own question. Open code refers to statements that are executed directly by the sas system. Understanding the differences in the way the two do loops work can help you avoid some potential. Create html, pdf, rtf, and files with ods statements. List all files within a directory including subdirectories. Use do loops to eliminate redundant code and to perform repetitive calculations. A vba macro to convert all rtf files within one folder.
A quick intro to sas arrays and do loops gopinath narasimhan saskatchewan cancer agency march 12, 2014. Use the rank function to return the position of a character in the ascii or ebcdic collating sequence. Import and export nonsas files use a procedure to transfer a csv file. Iterative do loops, do until and do while provide a wide variety of ways to perform repeated actions on your sas datasets over and over. We take a look at 4 different ways to use the do statement. A recursive sas macro to automate importing multiple excel worksheets into sas data sets. The %sysfunc function is needed to use sas functions within the macro facility. Normally for different studies, the number of sheets and sheet names are different, thus using. Use the %do statement to loop through the entire directory based on the number of members returned from the dnum function. Are you looking to become a faster, more efficient sas programmer. Using filevar to read multiple external files in a data step. A %do statment is part of the sas macro language, not normal sas. Im a long time sas programmer looking to make the jump to r. Introduction on vba macro to convert rtf files into pdf files.
The do statement, the simplest form of dogroup processing, designates a group of statements to be executed as a unit, usually as a part of ifthenelse statements. Initially, you only need to fill cell b2 and cell c2. A sas macro to automate importing excel worksheets into. If i do it the way in the code above, only the last loops results are saved in each of the files, because every iteration overwrites the previous one, instead of appending to the bottom of it. Some languages support a foreach loop that iterates over objects in a collection. More advanced macro techniques after mastering the basic techniques discussed earlier in this chapter, you may want to learn some more advanced macro techniques. An easy way to run thousands of regressions in sas 16. Do loop processing do loop processing statements within a do loop execute for a specific number of iterations or until a specific condition stops the loop. Different operating environments call an aggregate grouping of files by different names, such as a directory, a maclib, or a partitioned data set. Instructor stacey syphus explains how to identify which sections of code are being repeated and consolidate it in iterative and conditional do loops. I want all regression outputs to be in pdf file 1, all print outputs in pdf file 2 and all plot outputs in pdf file 3.
The do statement designates a group of statements that are to be executed as a unit, usually as a part of ifthenelse statements. The two other types of do loops available are the do until and the do while. There shouldnt be any repeated code if youre just changing the loop orders. Sas doesnt support that syntax directly, but there is a variant of the do loop in which you can iterate over values in a specified list.