Search for symbols that rose sharply

[kkrac]

I've seen other posts talking about angle calculation, but for some reason I can make it work.

I've used the code in the thinkOrSwim reference page for ATan to calculate an angle:

declare lower;
input length = 50;
def avg = Average(close, length);
def height = avg - avg[length];
plot "Angle, deg" = ATan(height/length) * 180 / Double.Pi;

I created an indicator "slope" at the bottom of my chart below, which shows the slope of the 50 moving average (blue line), using the code above.
The trend line I drew says that the angle from the last point 50 bars back is 7.93º, so I would expect the "slope" indicator to show the same value for that last point in the chart but instead it says 0.393685.
Why??
Can anyone explain?
Thanks in advance

 

[halcyonguy]

I've seen other posts talking about angle calculation, but for some reason I can make it work.

I've used the code in the thinkOrSwim reference page for ATan to calculate an angle:

declare lower;
input length = 3;
def avg = Average(close, length);
def height = avg - avg[length];
plot "Angle, deg" = ATan(height/length) * 180 / Double.Pi;

I created an indicator "slope" at the bottom of my chart below, which shows the slope of the 50 moving average (blue line), using the code above.
The trend line I drew says that the angle from the last point 50 bars back is 7.93º, so I would expect the "slope" indicator to show the same value for that last point in the chart but instead it says 0.393685.
Why??
Can anyone explain?
Thanks in advance

explain ? , no, not without seeing the code.
please post the code you have trouble with and i'm sure someone will spot something.

i've never understood, why do people ask for help to fix their code,... and then don't post their code.

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my opinion, a chart has 2 different axis units, dollars and time. the image can change with zooming, so calculating an angle number is questionable. what i do for slope is, find the average change in dollars over a quantity of bars , $/bars

 

[kkrac]

explain ? , no, not without seeing the code.
please post the code you have trouble with and i'm sure someone will spot something.

i've never understood, why do people ask for help to fix their code,... and then don't post their code.

---------

my opinion, a chart has 2 different axis units, dollars and time. the image can change with zooming, so calculating an angle number is questionable. what i do for slope is, find the average change in dollars over a quantity of bars , $/bars

Hi @halcyonguy, thanks for the reply

But the code is there. Now that I look at it I think I forgot to update in the code the actual length of the average that I used, my bad.
I just updated it, the length I used was actually 50, not 3 as it read originally.

I think the problem was that the angle shown with the trendline says 7.93 degrees, whereas the value for the indicator (in cyan) for the right dot of the trendline (where I had the cursor of the mouse) says 0.393685. So was a bit confused, not sure if they were showing different type of units or what.


Interesting what you mention about finding the average change in dollars vs. quantity of bars...

 

[kkrac]

I want to look for symbols for which their ema21 in the 5 minute chart were up in a 30 degree angle or more, for at least 12 candles (1 hour), at some point during the day.

I tried to use this code below, but it's not working as expected: I know that on May 10th, for instance $HCDI met the condition, but it's not showing up in the results of the scan.

Can someone let me know where the issue is?

def lookBack = 12;
def minSlope = 30;
def ema21 = ExpAverage(close, 21);

def maDiff = ema21 - ema21[lookBack];
def maSlope = Atan(maDiff / lookBack) * 180 / Double.Pi;

def startTime = 0930;
def endTime = 1600;
def targetPeriod = SecondsFromTime(startTime) >= 0 and SecondsTillTime(endTime) >= 0;

def isSteepSlope = if targetPeriod and !targetPeriod[1] then 0
                   else if !targetPeriod then isSteepSlope[1]
                   else if maSlope >= minSlope then 1
                   else 0;

plot signal = isSteepSlope;

 

[Chemmy]

I want to look for symbols for which their ema21 in the 5 minute chart were up in a 30 degree angle or more, for at least 12 candles (1 hour), at some point during the day.

I tried to use this code below, but it's not working as expected: I know that on May 10th, for instance $HCDI met the condition, but it's not showing up in the results of the scan.

Can someone let me know where the issue is?

def lookBack = 12;
def minSlope = 30;
def ema21 = ExpAverage(close, 21);

def maDiff = ema21 - ema21[lookBack];
def maSlope = Atan(maDiff / lookBack) * 180 / Double.Pi;

def startTime = 0930;
def endTime = 1600;
def targetPeriod = SecondsFromTime(startTime) >= 0 and SecondsTillTime(endTime) >= 0;

def isSteepSlope = if targetPeriod and !targetPeriod[1] then 0
                   else if !targetPeriod then isSteepSlope[1]
                   else if maSlope >= minSlope then 1
                   else 0;

plot signal = isSteepSlope;

So, what I think you may not be considering (and what @halcyonguy mentioned) is exactly how slow a 21-candle EMA can move; these EMAs are moving in terms of cents, or fractions of dollars, while each new candle moves in integers. Therefore, any sort of slope or angle calculation using Tan is going to be giving you minuscule values rather than an accurate slope. What you may want to try is normalizing the values instead -- I added a simple multiplication by 10 to your code and it seems to be doing the job (I also added absolute value code for the EMA falling steeply as well):

Is that what you had in mind? I didn't do anything in terms of showing the signals other than changing them to arrows, and adding test logic in. Here's the code below if you want to fix it up to your preference:

input show_test = yes;
input lookBack = 5;
input minSlope = 30;
input malen = 21;
plot ema21 = ExpAverage(close, malen);

def maDiff = 10*(ema21 - ema21[lookBack]);
def maSlope = Atan(maDiff / lookBack) * 180 / Double.Pi;

def startTime = 0930;
def endTime = 1600;
def targetPeriod = SecondsFromTime(startTime) >= 0 and SecondsTillTime(endTime) >= 0;

def isSteepSlope = if targetPeriod and !targetPeriod[1] then 0
                   else if !targetPeriod then isSteepSlope[1]
                   else if AbsValue(maSlope) >= minSlope then 1
                   else 0;

addlabel(show_test, "Diff: " + madiff, color.yellow);
addlabel(show_test, "Slope: " + maSlope, color.yellow);

plot signal = isSteepSlope;
signal.setpaintingstrategy(paintingstrategy.boolean_arrow_down);
ema21.sethiding(!show_test);