why is my code is not working?

% Binomial distribution
binom_var1 = binornd(n1, p1, [1, 10]);
binom_var2 = binornd(n2, p2, [1, 10]);

% Geometric distribution
geom_var1 = geornd(p1, [1, 10]);
geom_var2 = geornd(p2, [1, 10]);

% Poisson distribution
poiss_var1 = poissrnd(λ1, [1, 10]);

Invalid text character. Check for unsupported symbol, invisible character, or pasting of non-ASCII characters.

Error in connector.internal.fevalMatlab

Error in connector.internal.fevalJSON

poiss_var2 = poissrnd(λ2, [1, 10]);
% Binomial PMF and CDF
binom_pmf1 = binopdf(0:n1, n1, p1);
binom_pmf2 = binopdf(0:n2, n2, p2);
binom_cdf1 = binocdf(0:n1, n1, p1);
binom_cdf2 = binocdf(0:n2, n2, p2);

% Geometric PMF and CDF
geom_pmf1 = geopdf(0:max(geom_var1), p1);
geom_pmf2 = geopdf(0:max(geom_var2), p2);
geom_cdf1 = geocdf(0:max(geom_var1), p1);
geom_cdf2 = geocdf(0:max(geom_var2), p2);

% Poisson PMF and CDF
poiss_pmf1 = poisspdf(0:max(poiss_var1), λ1);
poiss_pmf2 = poisspdf(0:max(poiss_var2), λ2);
poiss_cdf1 = poisscdf(0:max(poiss_var1), λ1);
poiss_cdf2 = poisscdf(0:max(poiss_var2), λ2);
% Plot binomial distribution PMF and CDF
figure;
subplot(2,2,1);
stem(0:n1, binom_pmf1);
xlabel('k');
ylabel('P(X=k)');
title(['Binomial Distribution, p=', num2str(p1), ', n=', num2str(n1)]);
subplot(2,2,2);
stem(0:n2, binom_pmf2);
xlabel('k');
ylabel('P(X=k)');
title(['Binomial Distribution, p=', num2str(p2), ', n=', num2str(n2)]);
subplot(2,2,3);
stairs(0:n1, binom_cdf1);
xlabel('k');
ylabel('F(X=k)');
title(['Binomial Distribution, p=', num2str(p1), ', n=', num2str(n1)]);
subplot(2,2,4);
stairs(0:n2, binom_cdf2);
xlabel('k');
ylabel('F(X=k)');
title(['Binomial Distribution, p=', num2str(p2), ', n=', num2str(n2)]);

% Plot geometric distribution PMF and CDF
figure;
subplot(2,1)

Answer 1

[Vilém Frynta]

You cannot use special symbols for variables. You can only use

• numbers
• letters
• underscore ( _ )

Rename your variable.

[Rik]

More strictly speaking: function names and variable names must match the regular expression [a-zA-Z][a-zA-Z0-9_]* and be shorter than namelengthmax (which is currently 63 and is not expected to change any time soon).

Answer 2

[Walter Roberson]

poiss_var1 = poissrnd(λ1, [1, 10]);

The λ is valid in MATLAB under the following circumstances:

• inside a % comment
• inside a %{ %} block comment
• after a ... that marks a line continuation (everything after that on the line is a comment)
• inside a ' ' character vector
• inside a " " string() literal

It is not valid in any portion of a variable name or function name.

If you are trying to indicate that you want lambda to be 1 in the call to poissrnd then use

poiss_var1 = poissrnd(1, [1, 10]);

with no λ character.