This program segment prints the even numbers between 1 and 10 in decreasing order: INTEGER I However, you can define the step to be any number but zero. The variable defined in the DO-statement is incremented by 1 by default. Recall that column positions 1-5 are reserved for statement labels and the numerical value of statement labels has no significance (see the explanation of Statement Labeland Column Position Rulesin the first part of this post: Fortran ‘Must Knows’ for Writing Subroutines in Abaqus (PART I) ) Here is a simple example that prints the cumulative sums of the integers from 1 through N (assume N has been assigned a value elsewhere): INTEGER I, N, SUM If it is omitted, the default value is 1.Īlso, another general form of the DO loop that you may see is as follows: DO label count_variable = start, stop, step
start, stop, and step are integer variables or integer expressions. Where the count_variable must be an integer variable. Start specifies the initial value of count_variable, The general format is: DO count_variable = start, stop, stepĬount_variable is the loop variable (often called the ‘ loop index’ or ‘counter’).
#SIMPLY FORTRAN REVIEW SERIES#
This loop repeats a series of one or more Fortran statements a set number of times. Here we only take a look at DO-loop in Fortran. Loopsįor repeated execution of similar things, loops are used. Then the associated statements are executed, and the control resumes after the endif. The conditional expressions are evaluated in a row until one is found to be true. General Form IF ( logical expression1) THEN statements1 ELSE IF ( logical expression2) THEN statements2 More than one executable statement IF ( logical expression) THEN Statement1 Statement2ĮND IF III. One-line (one executable statement) IF ( logical expression) executable statementĮxample: IF (X. The most common conditional statement in Fortran is the IF statement, which has several forms: I.
The order of precedence is essential: arithmetic expressions are evaluated first, then relational operators, and finally logical operators (Take a look at Quiz Time question 3).
The result of an expression is itself an operand hence we can nest expressions together. The simplest non-constant expressions are of the form: Follow this post to know more about Fortran for Abaqus subroutines.
#SIMPLY FORTRAN REVIEW HOW TO#
Here, we will discuss the remaining topics such as Operators and Expressions (for Variables and Matrices), Conditional ( IF) and Loop ( DO) Statements, some Build-in Functions in Fortran, and finally, a brief talk about How to Write to files from inside Fortran. We have also talked about different Fortran Data Types, including Numerical, Non-numerical Variables and Arrays. We would like to acknowledge the Nuclear Regulatory Commission (NRC) for providing the initial funding to develop this extension and for allowing us to make it open-source.In the previous blog post, F ortran ‘Must Knows’ for Writing Subroutines in Abaqus (PART I), we review some of the Fortran basics vital for us to write an Abaqus subroutine. Please open an issue to report a bug, or request a feature so that it can be discussed before submitting a pull request. Contributingįor background material and getting started, I found this video to be a great start, and of course the official documentation. Use one of the entries in the Extensions->fpm menu to execute fpm build, fpm run or fpm test, using the options specified in the previous step. Note that leaving an option blank is valid, as it means the extension will simply not include that in the options passed to fpm, and thus fpm will simply use the default. In the Tools->Options dialog, find the entry "fpm Options", and specify the appropriate values for the various options.
This extension adds options and menu entries for building, running and testing your Fortran project using the Fortran Package Manager (fpm).
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