Help/UGens/Info/CheckBadValues.html

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  26 <p class="p1"><span class="s1"><b>CheckBadValues<span class="Apple-tab-span">   </span><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span></b></span><b>test for infinity, not-a-number, and denormals</b></p>
  27 <p class="p2"><br></p>
  28 <p class="p3"><b>CheckBadValues.ar(in, id, post)</b></p>
  29 <p class="p3"><b>CheckBadValues.kr(in, id, post)</b></p>
  30 <p class="p4"><br></p>
  31 <p class="p3">This UGen tests for infinity, NaN (not a number), and denormals. If one of these is found, it posts a warning. Its output is as follows: 0 = a normal float, 1 = NaN, 2 = infinity, and 3 = a denormal.</p>
  32 <p class="p3"><b>in</b> - the UGen whose output is to be tested</p>
  33 <p class="p3"><b>id</b> - an id number to identify this UGen. The default is 0.</p>
  34 <p class="p3"><b>post</b> - One of three post modes:</p>
  35 <p class="p3"><span class="Apple-tab-span">     </span>0 = no posting;</p>
  36 <p class="p3"><span class="Apple-tab-span">     </span>1 = post a line for every bad value;</p>
  37 <p class="p3"><span class="Apple-tab-span">     </span>2 = post a line only when the floating-point classification changes (e.g., normal -&gt; NaN and vice versa)</p>
  38 <p class="p4"><br></p>
  39 <p class="p3">The default post mode is 2. Post mode 1 is retained for backward compatibility; be aware that it generates a large amount of output.</p>
  40 <p class="p5"><br></p>
  41 <p class="p5"><br></p>
  42 <p class="p6"><span class="s2">{ </span><span class="s3">CheckBadValues</span><span class="s2">.kr(</span><span class="s3">SinOsc</span><span class="s2">.ar); 0}.play </span>// nothing wrong here</p>
  43 <p class="p5"><br></p>
  44 <p class="p7">{ <span class="s3">CheckBadValues</span>.kr(1 / 0, 1).poll; 0 }.play <span class="s4">// check infinity</span></p>
  45 <p class="p5"><br></p>
  46 <p class="p7">x = { <span class="s3">arg</span> test = -1; <span class="s3">CheckBadValues</span>.kr(test); 0 }.play <span class="s4">// check NaN</span></p>
  47 <p class="p7">x.set(<span class="s5">\test</span>, -1.sqrt);</p>
  48 <p class="p5"><br></p>
  49 <p class="p6">// don't post, but do something with the output</p>
  50 <p class="p7">(</p>
  51 <p class="p7">x = { <span class="s3">arg</span> freq = 440;</p>
  52 <p class="p7"><span class="Apple-tab-span">     </span><span class="s3">var</span> good;<span class="Apple-converted-space"> </span></p>
  53 <p class="p7"><span class="Apple-tab-span">     </span>good = <span class="s3">BinaryOpUGen</span>(<span class="s5">'=='</span>, <span class="s3">CheckBadValues</span>.kr(freq, 0, 0), 0);</p>
  54 <p class="p6"><span class="s2"><span class="Apple-tab-span">    </span></span><span class="s3">SinOsc</span><span class="s2">.ar(freq, 0, 0.1) * good </span>// silence the output if freq is bad</p>
  55 <p class="p7">}.play;</p>
  56 <p class="p7">)</p>
  57 <p class="p7">x.set(<span class="s5">\freq</span>, -1.sqrt);</p>
  58 <p class="p5"><br></p>
  59 <p class="p6">// the UGen method checkBadValues passes through the input for quick testing</p>
  60 <p class="p7">{ <span class="s3">SinOsc</span>.ar(440, 0, 0.1).checkBadValues }.play</p>
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