Problem with undefined function

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Ourania
Ourania on 29 Jan 2023
Edited: Torsten on 29 Jan 2023
Here , it a part of my code.
PGA=[1.0000000e-01,2.0000000e-01,4.0000000e-01,9.00000e-01,1.00000e+00,1.4000000e+00,0.500000e+00,1.700000e+00,2.00000e+00,2.5000000e+00,2.800000e+00,3.5000000e+00].';
Z1=log(PGA/th1)/b1;
for i=0:1:11
if Z1(i+1)<0
Z1(i+1)=Z1(i+1)+1;
P1=logncdf(Z1(i+1));
else
P1=logncdf(Z1(i+1));
end
P1(i+1)=P1;
end
disp(P1);
Error message:
Undefined function 'logncdf' for input arguments of type 'double'.
Error in excersise_1 (line 25)
P1=logncdf(Z1(i+1));

Answers (2)

Paul
Paul on 29 Jan 2023
logncdf is a function in the Statistics and Machine Learning Toolbox. That toolbox needs to be installed and it will have to be included on your license.

Torsten
Torsten on 29 Jan 2023
Edited: Torsten on 29 Jan 2023
An alternative without the toolbox:
logncdf_user = @(x,mu,sigma) 0.5*(erf((log(x)-mu)/(sqrt(2)*sigma))+1);
x=0:0.1:10;
hold on
plot(x,logncdf_user(x,0,1))
plot(x,logncdf(x,0,1))
hold off
grid on

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