Test the High if equal to $XX.50

[DanielManahan]

I want to test the high price of a stock true if any dollar number but not true if after the decimal it is not $xx.50

so $10.50 is true
but $10.49 and $10.51 is not true

so $11.50 is true
but $11.49 and $11.51 is not true

etc...

and same for all dollar numbers

dollars are a variable but the fraction is a user defined number.

 

[mashume]

declare lower;

plot NotFourBits = if high % 1 == 0.5 then 0 else 1;

this uses modulo arithmetic to look at the remainder. Anything divided by itself will leave only the decimal portion of the number. We then compare that to 0.5 and return 1 (true) if it is not equal and 0 (false) if it is true. (that statement makes my head hurt)

-mashume

 

[DanielManahan]

this works perfect

great now if I try to add several user inputs such as 0.5 or 0.25 or 0.75 I get an unexpected result the whole line is 1 never any zero.
declare lower;

input PsychoNumber1 = 0.5;
input PsychoNumber2 = 0.25;
input PsychoNumber3 = 0.75;

plot PsychologicalNumbers = if high % 1 == (PsychoNumber1 or PsychoNumber1 or PsychoNumber1) then 1 else 0;

this code produces a straight line at 1. I expect it to produce zero and only one if the decimals are 0.5 or 0.25 or 0.75

am I not combining the Or statement properly? should there be an And/Or type of statement instead? I can't find the syntax that works here.

 

[mashume]

OK.

declare lower;

def cents = high % 1;
plot TwoBitMultiples = if cents == 0.25 or cents == 0.50 or cents == 0.75 then 1 else 0;

I moved the modulo arithmetic out of the comparison for efficiency. calculate once, compare many is more efficient.

as to what constitutes a 1 or a zero, 1 is usually true and 0 is false. Your original post asked:

...stock true if any dollar number

so I made everything 1 unless it wasn't at the half-dollar mark.
your statement

but not true if after the decimal it is not $xx.50

contains a double negative and is therefore ambiguous, so I took the first part (which is clear) and used that as the basis for what was 1 and what was zero.

This version makes more sense to my head, where a value at $0.25 multiples excluding the round dollar is true and everything else is false.
If it plots a straight line, then the chart has nothing that is exactly on the quarters. Look at something like /es and it'll ALL be true, since the tick size there is 0.25.

-mashume