Check a slope of MACD in 3 bar is up trend

Hi

if I need to check a slope of MACD in 3 bar before buying point. (check if slope id up or down)

is there any function for it.

Please advice

I am beginner so please forgive me if I turn into "captain obvious" here but :

you may check LinearReg, it gives you the slope.
ROC of the slope > 0 or < 0 would tell you whether slope is up or down.

Thank you for your help.

welcome, hope it helped.

Slope = rate of change so look at ROC()

Look for MACD Histogram for the trend reversals which is more helpful.