# Delete row if next row has the same first value, python

## Question:

I have an array that looks like this:

`data([0.000, 1], [0.0025, 2], [0.0025, 3], [0.005, 5])`

I need to delete [0.0025, 3], because it has the same first value as the one before.

I have tried:

```
for i in data:
if data[i, 0] == data[i+1,0]:
np.delete(data, (i+1), axis = 0)
```

But then I get the following Error:

`IndexError: arrays used as indices must be of integer (or boolean) type`

,

Can somebody help me with that

## Answers:

input:

```
data = np.array([[0.000, 1], [0.0025, 2], [0.0025, 3], [0.005, 5]])
```

solution:

```
data = data[np.unique(data[:,0], return_index=True)[1]]
```

output:

```
array([[0.0e+00, 1.0e+00],
[2.5e-03, 2.0e+00],
[5.0e-03, 5.0e+00]])
```