Difference: FloatingPointUnit (34 vs. 35)

Revision 352022-11-17 - PeterSchmid

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pi ( -- r ) r is pi, approx. 3.14159274101257324 e ( -- r ) r is e, approx. 2.7182818

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> fnumber (a # -- r u ) convert the specified string by a and # to float r, on success u is 1, otherwise 0 >float (a # -- r ? ) convert the specified string by a and # to float r, on success flag is true

f. ( r -- ) display, with a trailing space, the floating-point number r in fixed-point notation fs. ( r -- ) display, with a trailing space, the floating-point number r in scientific notation fe. ( r -- ) display, with a trailing space, the floating-point number r in engineering notation

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C mathematical functions

@ Wikipedia

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< fnumber (a # -- r u ) convert the specified string by a and # to float r, on success u is 1, otherwise 0 >float (a # -- r ? ) convert the specified string by a and # to float r, on success flag is true (more robust)

fsin ( r1 -- r2 ) r2 is the sine of the radian angle r1 fcos ( r1 -- r2 ) r2 is the cosine of the radian angle r1 ftan ( r1 -- r2 ) r2 is the principal radian angle whose tangent is r1

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How to Use

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> Calculation of two parallel resistors:

: f|| ( r1 r2 -- r3) 
  2dup f* -rot f+ f/ 
;

27k 100k f|| fm.  21.3k  ok.

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< 2.2n 47k f* fm. 103u ok.

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RC time constant

2.2n 47k f* fm. 103u  ok.

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> Mecrisp-Cube has the word f. defined as an assembler routine in fpu.s, but the example here is written in Forth. I use a dot for the decimal separator. Terry Porter "because those crazy Europeans use a comma instead of a decimal point". Not all europeans are crazy, at least the Swiss are an exception ;-), they use sometimes decimal points.

: f. ( r -- )  \ display, with a trailing space, the floating-point number r in fixed-point notation
  dup  f0< if

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