Beginner fortran question - starting with a new slate

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    Beginner Fortran
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SUMMARY

The discussion centers on the challenges faced by a beginner using Fortran 77, specifically regarding variable initialization and matrix assignment. The user seeks methods to ensure variables start at zero and to efficiently assign values to a 3x3 matrix. It is established that Fortran 77 does not provide built-in functions for these tasks, requiring manual initialization of variables and the use of loops for matrix assignments. The community emphasizes the necessity of these approaches in Fortran programming.

PREREQUISITES
  • Understanding of Fortran 77 syntax and structure
  • Familiarity with variable declaration and initialization concepts
  • Basic knowledge of array manipulation in programming
  • Experience with programming loops for repetitive tasks
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  • Research Fortran 77 variable initialization techniques
  • Learn about array handling and manipulation in Fortran 77
  • Explore the use of loops for matrix operations in Fortran
  • Investigate best practices for transitioning from MATLAB to Fortran
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Beginner Fortran programmers, educators teaching Fortran 77, and developers transitioning from MATLAB to Fortran.

Moly
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Hi All

I am new to fortran and there are things that I believe fortran should do and don't know how to do it - I am using fortran 77.

1- I know how to declare variables, but i do not know how to make sure that i start out with zeros and not use old data that might have been stored by a previous program run or randomly assigned by the memory. (the equivalent of clear all in matlab)

2- If i declare a 3 by 3 matrix called A, and I want to assign the value 4 for each of the elements of the matrix, what is the simplest way of doing that? Setting A=4 did not work for me. I can put it in a loop but i feel there has to be an easier way if i am doing something as simple as this. [in MATLAB i would simply say A(:,:)=4]

Thanks for your help in advance.
 
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Unfortunately, there are no shortcuts. Set every variable to zero, use loops to initialize array.
 
Thanks for the prompt reply Borek. I am glad I asked instead of banging my head against the screen until next week. Thanks again.
 

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