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<div>Here are some tips from Alex van den Bogaerdt (bold) which i tried:
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<div name="quoted-content"><strong>Try adding: CDEF:stufe_debug=stufe,UN,75,stufe,IF<br/>
and graph this as a line or area. Does it go up to 75? Then you have<br/>
unknowns in the data.</strong><br/>
<br/>
<em>- I have removed alles DEFs and CDEF as mentioned and then added the<br/>
- DEF:stufe_debug=stufe,UN,75,stufe,IF</em><br/>
<br/>
<em>- the line then draws at 75 - so there must be unknown data?<br/>
- GPRINT stufe_debug is 75.000000 </em><br/>
<br/>
<strong>Currently you are not interested in the cases where stufe is 0,1,2 or 3.<br/>
After all, you would not be debugging if everything worked.<br/>
So try adding</strong><br/>
<br/>
<strong>CDEF:stufe_debug=10,stufe,25,*,stufe,1,EQ,stufe,2,EQ,stufe,3,EQ,stufe,0,EQ,+,+,+,IF<br/>
(by the way: everything is untested, you make it work should changes be<br/>
required)</strong><br/>
<br/>
- After editing the DEF to<br/>
- CDEF:stufe_debug=10,stufe,25,*,stufe,1,EQ,stufe,2,EQ,stufe,3,EQ,stufe,0,EQ,+,+,+,IF<br/>
- The Line is at 50 (stufe is currently at "2")<br/>
- GPRINT stufe_debug is 50.000000<br/>
<br/>
<strong>This should work like so: 4 compares which return 1 for true or 0 for false.<br/>
If any of them is true, the IF will return the first value (10), else the<br/>
second value (stufe*25).<br/>
<br/>
Possible outcomes could be:<br/>
unknown (blank) in case stufe is unknown <== there's your problem</strong><br/>
<em>- i see a line, so there is no unknown data?!</em><br/>
<br/>
<strong>10, in case stufe is 0,1,2 or 3 <== expected result, which we do not want to<br/>
see while hunting for this bug<br/>
<br/>
25*stufe if stufe is different <== there's your problem</strong><br/>
<em>- The value is 50 which is 25*stufe (currently stufe is "2")</em><br/>
<br/>
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