System Variable FPC: Difference between revisions

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<h1>{quad}FPC - Floating Point Control</h1>
<h1><aplxx>⎕FPC</aplxx> - Floating Point Control</h1>
{{BoxStart|<apll>Z←⎕FPC</apll>
{{BoxStart|<apll>Z←⎕FPC</apll>
|returns the current value of the Floating Point Control precision.}}
|returns the current value of the Floating Point Control precision.}}
{{BoxEnd|<apll>Z</apll> is an integer scalar that represents the current value of the number of bits of precision used for [[Rational and VFP Numbers|VFP numbers]].}}
{{BoxEnd|<apll>Z</apll> is an integer scalar that represents the current value of the number of bits of precision used for [[Rational and VFP Numbers|Multiple-Precision Floating Point numbers]].}}
<br />
<br />


Line 15: Line 15:
<br />
<br />


<p>The minimum value for <apll>⎕FPC</apll> is <apll>53</apll>; the maximum value is the largest positive 32-bit integer <apll>2147483647</apll>.</p>
<p>The minimum value for <apll>⎕FPC</apll> is <apll>1</apll>; the maximum value is the largest positive 32-bit integer <apll>2147483647</apll>.</p>


<p>The system default value is <apll>128</apll>.</p>
<p>The system default value is <apll>128</apll>.</p>
Line 22: Line 22:
<p>For example, (note: these numbers are normally one long string of digits; they are broken here, with the break shown by '''(continued)''' for your convenience in reading)</p>
<p>For example, (note: these numbers are normally one long string of digits; they are broken here, with the break shown by '''(continued)''' for your convenience in reading)</p>


<apll>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;⎕PP←240<br />
<apll><pre>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;⎕FPC←64 &nbsp;⋄ *1x<br />
      ⎕PP←240
2.71828182845904523543<br />
      ⎕FPC←64 ⋄ *1x  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;⎕FPC←128 ⋄ *1x<br />
2.7182818284590452354
2.718281828459045235360287471352662497759<br />
      ⎕FPC←128 ⋄ *1x  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;⎕FPC←256 ⋄ *1x<br />
2.71828182845904523536028747135266249776
2.71828182845904523536028747135266249775724709369995957496696762 (Continued)<br/>
      ⎕FPC←256 ⋄ *1x  
7724076630353555<br />
2.71828182845904523536028747135266249775724709369995957496696762 (Continued)  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;⎕FPC←512 ⋄ *1x<br />
772407663035355
2.71828182845904523536028747135266249775724709369995957496696762 (Continued)<br/>
      ⎕FPC←512 ⋄ *1x  
7724076630353547594571382178525166427427466391932003059921817413 (Continued)<br/>
2.71828182845904523536028747135266249775724709369995957496696762 (Continued)  
59662904357290033429526059559<br />
7724076630353547594571382178525166427427466391932003059921817413 (Continued)  
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;⎕FPC←1024 ⋄ *1x<br />
5966290435729003342952605956
2.71828182845904523536028747135266249775724709369995957496696762 (Continued)<br/>
      ⎕FPC←1024 ⋄ *1x  
7724076630353547594571382178525166427427466391932003059921817413 (Continued)<br/>
2.71828182845904523536028747135266249775724709369995957496696762 (Continued)  
5966290435729003342952605956307381323286279434907632338298807531 (Continued)<br/>
7724076630353547594571382178525166427427466391932003059921817413 (Continued)  
9525101901157383418793070215408914993488416750924</apll>
5966290435729003342952605956307381323286279434907632338298807531 (Continued)  
9525101901157383418793070215408914993488416750924</pre></apll>


<p>Whereas, according to Wolfram Alpha, the exact value to 230 digits is</p>
<p>Whereas, according to Wolfram Alpha, the exact value to 230 digits is</p>


<apll>2.71828182845904523536028747135266249775724709369995957496696762 (Continued)<br/>
<apll><pre>2.71828182845904523536028747135266249775724709369995957496696762 (Continued)
7724076630353547594571382178525166427427466391932003059921817413 (Continued)<br/>
7724076630353547594571382178525166427427466391932003059921817413 (Continued)
5966290435729003342952605956307381323286279434907632338298807531 (Continued)<br/>
5966290435729003342952605956307381323286279434907632338298807531 (Continued)
9525101901157383418793070215408914993488...</apll><br /><br>
9525101901157383418793070215408914993488...</pre></apll>
'''See Also: [[System_Variable_CT|Comparison Tolerance ⎕CT]]'''<br>
 
'''See Also: [[System_Variable_CT|Comparison Tolerance ⎕CT]]'''




{{System Variables}}
{{System Variables}}
{{Article footer}}
{{Article footer}}

Revision as of 12:16, 16 April 2018

⎕FPC - Floating Point Control

Z←⎕FPC returns the current value of the Floating Point Control precision.
Z is an integer scalar that represents the current value of the number of bits of precision used for Multiple-Precision Floating Point numbers.


⎕FPC←R sets the value of the Floating Point Control precision to R.
⎕FPC←⍬ sets the value of the Floating Point Control precision to its system default state.


The minimum value for ⎕FPC is 1; the maximum value is the largest positive 32-bit integer 2147483647.

The system default value is 128.


For example, (note: these numbers are normally one long string of digits; they are broken here, with the break shown by (continued) for your convenience in reading)

      ⎕PP←240 
      ⎕FPC←64  ⋄ *1x 
2.7182818284590452354 
      ⎕FPC←128 ⋄ *1x 
2.71828182845904523536028747135266249776 
      ⎕FPC←256 ⋄ *1x 
2.71828182845904523536028747135266249775724709369995957496696762 (Continued) 
772407663035355
      ⎕FPC←512 ⋄ *1x 
2.71828182845904523536028747135266249775724709369995957496696762 (Continued) 
7724076630353547594571382178525166427427466391932003059921817413 (Continued) 
5966290435729003342952605956 
      ⎕FPC←1024 ⋄ *1x 
2.71828182845904523536028747135266249775724709369995957496696762 (Continued) 
7724076630353547594571382178525166427427466391932003059921817413 (Continued) 
5966290435729003342952605956307381323286279434907632338298807531 (Continued) 
9525101901157383418793070215408914993488416750924

Whereas, according to Wolfram Alpha, the exact value to 230 digits is

2.71828182845904523536028747135266249775724709369995957496696762 (Continued)
7724076630353547594571382178525166427427466391932003059921817413 (Continued)
5966290435729003342952605956307381323286279434907632338298807531 (Continued)
9525101901157383418793070215408914993488...

See Also: Comparison Tolerance ⎕CT


System Variables (A value may be assigned to these except for ⎕DM)
⎕ALX ⎕CT ⎕DM ⎕DT ⎕ELX ⎕FC ⎕FEATURE ⎕FPC ⎕IC ⎕IO
⎕LR ⎕LX ⎕PP ⎕PR ⎕PW ⎕RL ⎕SA ⎕WSID
Niladic System Functions (a value cannot be assigned to these)
⎕A ⎕AV ⎕EM ⎕ET ⎕LC ⎕NNAMES ⎕NNUMS ⎕SI ⎕SYSID ⎕SYSVER
⎕T ⎕TC ⎕TCBEL ⎕TCBS ⎕TCESC ⎕TCFF ⎕TCHT ⎕TCLF ⎕TCNL ⎕TCNUL
⎕TS ⎕WA
Monadic or dyadic system functions (a value cannot be assigned to these)
⎕AT ⎕CR ⎕DC ⎕DFT ⎕DL ⎕DR ⎕EA ⎕EC ⎕ERROR ⎕ES
⎕EX ⎕FMT ⎕FX ⎕MF ⎕NAPPEND ⎕NC ⎕NCREATE ⎕NERASE ⎕NINFO ⎕NL
⎕NLOCK ⎕NREAD ⎕NRENAME ⎕NREPLACE ⎕NRESIZE ⎕NSIZE ⎕NTIE ⎕NUNTIE ⎕STOP ⎕TF
⎕TRACE ⎕UCS ⎕VR
Note that quad functions and variables (except for the ⎕A family of functions) are case insensitive


See Also
System Commands System Variables and Functions Operators


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