# Vector multiplication

I would like to know why this procedure doesn't work

```
aa = list(var('delta_%d' % i) for i in (0..2))
c=n(matrix(1,3,(-0.5,0.2,.3)),2)
U = e^(c*transpose(aa))
show(U)
```

Vector multiplication

I would like to know why this procedure doesn't work

```
aa = list(var('delta_%d' % i) for i in (0..2))
c=n(matrix(1,3,(-0.5,0.2,.3)),2)
U = e^(c*transpose(aa))
show(U)
```

add a comment

1

For one, because you can't transpose `list`

s. Secondly, you should take the (single) entry of `c*aa`

.

```
aa = vector(var('delta_%d' % i) for i in (0..2))
c = n(matrix(1,3,(-0.5,0.2,.3)),2)
U = e^((c*aa)[0])
show(U)
```

$$e^{\left(-0.50 \delta_{0} + 0.19 \delta_{1} + 0.25 \delta_{2}\right)}$$

(Note that you specified 2 *bits* of precision with `n`

.)

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Asked: ** 2019-11-12 16:09:27 +0200 **

Seen: **74 times**

Last updated: **Nov 13 '19**

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