Multiplying a DataFrame by a scalar has been deprecated and will not work
once you update to Julia 0.3 and the associated DataFrames version.
On Monday, August 18, 2014 6:10:44 PM UTC+3, Bradley Setzler wrote:
>
> Update: I found a 1-line command to convert everything in a DataFrame into
> a Float that seems to work generally:
>
> data = data*1.0
>
> So, for example,
> julia> A=DataFrame([1 2 ; 3 4])
> 2x2 DataFrame:
> x1 x2
> [1,] 1 2
> [2,] 3 4
> julia> A=A*1.0
> 2x2 DataFrame:
> x1 x2
> [1,] 1.0 2.0
> [2,] 3.0 4.0
>
> Best,
> Bradley
>
>
>
> On Monday, August 18, 2014 10:02:02 AM UTC-5, Bradley Setzler wrote:
>>
>> Hi John,
>>
>> Thanks for your reply, I'm getting the following:
>>
>> julia> A=DataArray([1 2; 3 4])
>> 2x2 DataArray{Int64,2}:
>> 1 2
>> 3 4
>> julia> A*.5
>> 2x2 DataArray{Float64,2}:
>> 0.5 1.0
>> 1.5 2.0
>>
>> julia> A/2.
>> 2x2 DataArray{Float64,2}:
>> 0.5 1.0
>> 1.5 2.0
>> julia> A/2
>> InexactError()
>>
>>
>> So it converts to Float if divided by Float, but does not convert if
>> divided by Integer.
>>
>> Best,
>> Bradley
>>
>>
>>
>> On Monday, August 18, 2014 9:31:43 AM UTC-5, John Myles White wrote:
>>>
>>> Hi Bradley,
>>>
>>> Would you consider using DataArrays for this? DataFrames no longer
>>> support these operations, so any upgrade in your setup would turn all of
>>> this code into errors.
>>>
>>> All of these operations work on DataArrays already.
>>>
>>> — John
>>>
>>> On Aug 18, 2014, at 7:28 AM, Bradley Setzler <[email protected]>
>>> wrote:
>>>
>>> >
>>> >
>>> > Good morning,
>>> >
>>> > I am looking for a simple way to convert an Integer DataFrame to a
>>> Float DataFrame. Here is an example of the problem:
>>> >
>>> > julia> using DataFrames
>>> > julia> A=DataFrame([1 2; 3 4])
>>> > 2x2 DataFrame:
>>> > x1 x2
>>> > [1,] 1 2
>>> > [2,] 3 4
>>> >
>>> > With multiplication, there is no problem automatically converting to
>>> Float:
>>> >
>>> > julia> A*.5
>>> > 2x2 DataFrame:
>>> > x1 x2
>>> > [1,] 0.5 1.0
>>> > [2,] 1.5 2.0
>>> >
>>> > But with division, for example, the conversion fails:
>>> >
>>> > julia> A/2
>>> > InexactError()
>>> >
>>> > Ideally, there would be a one-line command so that we don't have to
>>> worry about this issue, say DataFloat() of the form:
>>> >
>>> > julia> A=DataFloat(A)
>>> > 2x2 DataFrame:
>>> > x1 x2
>>> > [1,] 1.0 2.0
>>> > [2,] 3.0 4.0
>>> >
>>> > Does something like this exist?
>>> >
>>> > Thanks,
>>> > Bradley
>>> >
>>>
>>>
