How to element wise exponential of a matrix

How do I take the element-wise exponential of a matrix which looks like:

dy =

Columns 1 through 9

15.7800 31.5600 47.3400 63.1200 78.9000 94.6800 110.4600 126.2400 142.0200

Columns 10 through 18

157.8000 173.5800 189.3600 205.1400 220.9200 236.7000 252.4800 268.2600 284.0400

Columns 19 through 24

299.8200 315.6000 331.3800 347.1600 362.9400 378.7200

If I do exp(dy)

it's only giving me a set of zeros.

Please help.

Answer 1

[David Goodmanson]

Hi Titas,

dy =
  Columns 1 through 10
15.7800   31.5600   47.3400   63.1200   78.9000   94.6800  110.4600  126.2400  142.0200  157.8000
Columns 11 through 20
173.5800  189.3600  205.1400  220.9200  236.7000  252.4800  268.2600  284.0400  299.8200  315.6000
Columns 21 through 24
331.3800  347.1600  362.9400  378.7200
z = exp(dy)
z = 
  1.0e+164 *
  Columns 1 through 10
    0.0000    0.0000    0.0000    0.0000    0.0000    0.0000    0.0000    0.0000    0.0000    0.0000
  Columns 11 through 20
    0.0000    0.0000    0.0000    0.0000    0.0000    0.0000    0.0000    0.0000    0.0000    0.0000
  Columns 21 through 24
    0.0000    0.0000    0.0000    2.9923

It's a display issue. The numbers have such a wide range that only the last one, the largest, shows up in the default format. But if you look at them separately, the correct values are there:

z(1)

ans = 7.1313e+06

A good solution is format g:

format short g
z =
Columns 1 through 8
7.1313e+06   5.0855e+13   3.6266e+20   2.5862e+27   1.8443e+34   1.3152e+41   9.3793e+47   6.6886e+54
Columns 9 through 16
4.7698e+61   3.4015e+68   2.4257e+75   1.7298e+82   1.2336e+89    8.797e+95  6.2734e+102  4.4737e+109
Columns 17 through 24
3.1903e+116  2.2751e+123  1.6225e+130   1.157e+137   8.251e+143   5.884e+150   4.196e+157  2.9923e+164

[Titas Deb]

Thanks a lot. Is there any way to resolve that? I have a bunch of calculations to do on top of exponential on this matrix.

[David Goodmanson]

I'm not sure what you mean, because none of them are zeros. They look like a vector of zeros (except for the last one) when they are displayed in the conventional format. But none of them are stored as zero, as indicated by format short g.