Difference between revisions of "Extensions/Ideas/Calc"
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< Extensions | Ideas
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Formerly [https://issues.apache.org/ooo/show_bug.cgi?id=122171 bug 122171] | Formerly [https://issues.apache.org/ooo/show_bug.cgi?id=122171 bug 122171] | ||
| − | Quadratic | + | Quadratic equation ax^2+bx+c=0 |
Proposed added function: | Proposed added function: | ||
| Line 13: | Line 13: | ||
* quadratic(a,b,c,1) will return (-b+sqrt(b^2-4ac))/(2a) | * quadratic(a,b,c,1) will return (-b+sqrt(b^2-4ac))/(2a) | ||
* quadratic(a,b,c,2) will return (-b-sqrt(b^2-4ac))/(2a) | * quadratic(a,b,c,2) will return (-b-sqrt(b^2-4ac))/(2a) | ||
| + | * error if complex root | ||
== Numerical integration - Simpson's rules == | == Numerical integration - Simpson's rules == | ||
Revision as of 09:02, 12 May 2013
Contents
Calc Add-ins
Function to return roots of quadratic equation
Formerly bug 122171
Quadratic equation ax^2+bx+c=0
Proposed added function:
- quadratic(a,b,c,1) will return (-b+sqrt(b^2-4ac))/(2a)
- quadratic(a,b,c,2) will return (-b-sqrt(b^2-4ac))/(2a)
- error if complex root
Numerical integration - Simpson's rules
Formerly bug 122202
Given: equally spaced x values, x0 till xn and respective function values in two columns
- Three points n=2: Simpson's 1/3 ruleFunction
Simp13 = (x2-x0)*(f(x0)+4f(x1)+f(x2))/6
- Four points n=3: Simpson's 3/8 ruleFunction
Simp38 = (x3-x0)*(f(x0)+3f(x1)+3f(x2)+f(x3))/8
- Five points n=4: Simpson's 1/3 rule on first and last three points
- Six points n=5: Simpson's 1/3 rule on first three points and Simpson's 3/8 rule on last last four points
- etc.
Function to return astrological sign
Proposed added function:
- astrosign(19/07/2013)=Cancer
Function to return calling code
Proposed added function:
- callcode(Colombia)=57
