How do you put the constant e on matlab

I'm trying to write an equation with e, but I assume it would just take it as an undeclared variable.

Answer 1

[Star Strider]

You may want the exponential function exp (link), the base of the natural logarithms.

[Gabriele Bunkheila]

So I guess the answer to the question would be:

e = exp(1) % Euler's number

e = 2.7183

[Steven Lord]

Yes, though if you're planning to use it in expressions of the form e^t, instead of computing e separately then raising it to the power t I recommend calling exp with t as an input.

format longg
e = exp(1)

e = 
          2.71828182845905

y1 = e^2

y1 = 
          7.38905609893065

y2 = exp(2)

y2 = 
          7.38905609893065

[Walter Roberson]

As an example of the difference between exp(1)^n and exp(n) :

format long g
e = exp(1);
y1 = e^20; fprintf('%.999g\n', y1);

485165195.409789741039276123046875

y2 = exp(20); fprintf('%.999g\n', y2);

485165195.4097902774810791015625

y1 - y2

ans = 
     -5.36441802978516e-07

Answer 2

[Steven Lord]

Use the exp function.

Answer 3

[Ephendy Sithole]

exp