exp doesn't return the expected values

I have a matrix which is defined like this

x = [1 2 3; 4 5 6; 7 8 9];
y = exp(x)

y = 3×3

1.0e+03 * 0.0027 0.0074 0.0201 0.0546 0.1484 0.4034 1.0966 2.9810 8.1031

Why am I getting this result ? I expected a matrix which contains element by element exp

Answer 1

[Star Strider]

That is esactly what it is doing —

format longG
x = [1 2 3; 4 5 6; 7 8 9];
y = exp(x)

y = 3×3

1.0e+00 * 2.71828182845905 7.38905609893065 20.0855369231877 54.5981500331442 148.413159102577 403.428793492735 1096.63315842846 2980.95798704173 8103.08392757538

y11 = exp(1)

y11 = 
          2.71828182845905

y33 = exp(9)

y33 = 
          8103.08392757538

What were you expecting?

.

[Ahmed]

Oh okay I am sorry, I just didn't notice that the format is different.

[Star Strider]

No worries!

The ‘1.0e+3’ in the upper left of the display indicates that the entire displayed matrix is multiplied by the inverse of that number, ‘1E-3’ in this instance.

See the documentation on format for examples.

.

[Steven Lord]

I'm guessing they missed the factor of 1.0e+03 in the upper-left corner of the matrix and so thought MATLAB was returning 0.0027 for exp(1) when they expected 2.71828...