added rkf45 method #10438
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added rkf45 method #10438
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removed some whitespace |
cclauss
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Oct 14, 2023
cclauss
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Oct 14, 2023
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ravi-ivar-7
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Oct 14, 2023
|
updated rkf45.py as per suggestions |
cclauss
requested changes
Oct 14, 2023
maths/rkf45.py
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| #excact value of y[1] is tan(0.2) = 0.2027100355086 | ||
| >>> def f(x,y): | ||
| ... return 1+y**2 | ||
| >>> y=rkf45(f,0,0,0.2,1) |
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| >>> y=rkf45(f,0,0,0.2,1) | |
| >>> y=rkf45(f, 0, 0, 0.2, 1) |
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cclauss
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cclauss
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maths/rkf45.py
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| >>> y=runge_futta_fehlberg_45(f, 0, 0, 0.2, 1) | ||
| >>> y[1] | ||
| 0.2027100937470787 |
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We will need more than one test. What happens if x_initial is set to 5, -5, 5.5?
What happens if step_size is zero or negative?
What happens if x_final is zero or negative?
What happens if ode is 5 instead of being a function?
Let's have a test that raises a RangeError.
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- Condition on x_initial and x_final is that x_final should be greater than x_initial. They can be zero , negative or positive.
- Added exception for step_size as it should be positive.
- ode can be a constant function or a function of x and/or y.
ravi-ivar-7
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Oct 15, 2023
maths/rkf45.py
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| >>> y=runge_futta_fehlberg_45(f, 0, 0, 0.2, 1) | ||
| >>> y[1] | ||
| 0.2027100937470787 |
There was a problem hiding this comment.
- Condition on x_initial and x_final is that x_final should be greater than x_initial. They can be zero , negative or positive.
- Added exception for step_size as it should be positive.
- ode can be a constant function or a function of x and/or y.
|
Added more test cases and exception. |
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Nice one! It is great that you deal with invalid input. |
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@cclauss : Please add hacktoberfest-accepted label so that it can be accepted in hacktoberfest. |
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Sep 15, 2024
* added rkf45 method * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci * Updated rkf45.py * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci * Updated rkf45.py * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci * Update rkf45.py * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci * Update rkf45.py with suggestions * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci * Improved Code Quality rkf45.py * Added more test cases and exception rkf45.py * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci * Update rkf45.py * corrected some spellings. rkf45.py * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci * Update rkf45.py * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci * Update rkf45.py --------- Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com> Co-authored-by: Christian Clauss <[email protected]>
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Add an algorithm (rkf45) to TheAlgorithms / Python/maths