Very large real numbers should be written in exponential form

[ceraolo]

Description

Very large real numbers should be written in exponential form also in plotting perspective

Steps to Reproduce

Run the following code:

model Test
 parameter Real X=1e9;
 Real y;
equation
 y=time;
end Test;

This is what is displayed in plotting perspective:

X is too large, and difficult to read

Expected Behavior

I propose that numerical values be written in a more compact way. In this case the number could be written in several easily-readable ways, such as 1e9, 1.0e9, even 1.000e9.
Written as 1000000000 is unsatisfying for me: it requires the user to count zeros. Up to 1.000e9, the number is immediately identified without the need of counting zeros.

Screenshots

Version and OS

1.20.0

• OpenModelica Version: [e.g. omc --version or Help->About OMEdit from OMEdit]
• OS: [e.g. Windows 10, 64 bit]
• Versions of used Modelica libraries if applicable

Additional Context

[bilderbuchi]

In the same breath, very large non-"round" integers should probably not be written in floating-point notation? See this from your other issue #10475 -- this obfuscates the true value of the local seed variable (parameter integer).

[ceraolo]

In the same breath, very large non-"round" integers should probably not be written in floating-point notation? See this from your other issue #10475 -- this obfuscates the true value of the local seed variable (parameter integer).

I agree. However, this is a minor issue (how many people would be interested in knowing all digits of a very large integer number?).

[casella]

I guess Integers should be treated as such, an Reals as such. If X is a Real, it should be represented as 1e9, but if localSeed is an Integer, it should be represented as -698243567 (or whatever).

Another case for #8865.

[casella]

how many people would be interested in knowing all digits of a very large integer number?).

For example, if the integer is the seed of a random number generator, you need to see all the digits.

[ceraolo]

how many people would be interested in knowing all digits of a very large integer number?).

For example, if the integer is the seed of a random number generator, you need to see all the digits.

Obviously. This was also in #10476 (comment), which, btw,came from an example of mine!
Just because I'm working on these kinds of simulations, I understand the importance of knowing the seed. That's why I called it "a minor issue" (I did not say that it is not an issue).

[casella]

This should be easily fixed once we are done with PR 11168, we can just use _ryu_to_minimal with real_output = 0.