Evaluating the probability as a one tailed students t distribution

I have a value “tj” and I would like to evaluate the probability of this value using the students t distribution. I also have a variable “Df” degrees of freedom

[dpb]

https://www.mathworks.com/matlabcentral/answers/545762-obtaining-the-p-values-for-the-t-stat

Answer 1

[John D'Errico]

Just use tcdf.

df = 10;
ti = 2.35;

tcdf(-ti,df)
ans =
      0.02032

tcdf(ti,df)
ans =
      0.97968

So the probability you would see -ti OR less, is around 2% with 10 degrees of freedom. Likewise, the probability in the upper tail is

1 - tcdf(ti,df)
ans =
      0.02032