# Ratchet mechanism script help

#### MLlalala

##### Member
I need help with a ratchet mechanism which ensures that the lower band only moves up in an up-trend and the upper band only moves down in a down-trend.

For example, def Low = lowest(low, length), this value is only allowed to move UP.

Does anyone know how this will work?

Solution
I need help with a ratchet mechanism which ensures that the lower band only moves up in an up-trend and the upper band only moves down in a down-trend.

For example, def Low = lowest(low, length), this value is only allowed to move UP.

the first thing would be, don't define variable names the same as fundamental types or reserved words. it may be possible, but will be confusing.
https://tlc.thinkorswim.com/center/...Constants/FundamentalType/FundamentalType-LOW

maybe something like this ?
if in an up trend, then check for the max of 2 values, the previous value and the new value.

def uptrend = ...
def length = ...
def Low1 = lowest(low, length),
def Lowband = if ( uptrend == 1) then max( lowband[1]...
I need help with a ratchet mechanism which ensures that the lower band only moves up in an up-trend and the upper band only moves down in a down-trend.

For example, def Low = lowest(low, length), this value is only allowed to move UP.

the first thing would be, don't define variable names the same as fundamental types or reserved words. it may be possible, but will be confusing.
https://tlc.thinkorswim.com/center/...Constants/FundamentalType/FundamentalType-LOW

maybe something like this ?
if in an up trend, then check for the max of 2 values, the previous value and the new value.

def uptrend = ...
def length = ...
def Low1 = lowest(low, length),
def Lowband = if ( uptrend == 1) then max( lowband[1] , low1 ) else low1;

the first thing would be, don't define variable names the same as fundamental types or reserved words. it may be possible, but will be confusing.
https://tlc.thinkorswim.com/center/...Constants/FundamentalType/FundamentalType-LOW

maybe something like this ?
if in an up trend, then check for the max of 2 values, the previous value and the new value.

def uptrend = ...
def length = ...
def Low1 = lowest(low, length),
def Lowband = if ( uptrend == 1) then max( lowband[1] , low1 ) else low1;
Thank you, this is very helpful, I think i finally worked out!

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