[julia-users] Convert a string with commas into a float

[AVF]

What is the best way to convert a string such as "123,456" into a float 
123456.0? I could not find a method that would splice out a character from 
the middle of a string to feed the result to `float()`.

Thanks.

Re: [julia-users] Vectorized operation inside a function doesn't change a passed variable?

[AVF]

Thanks, Milan. Is there a way to predict a priori when the passed 
variable/object will be mutated? E.g., earlier last night I was surprised that 
my function below was mutating the passed data frame, not just the copy created 
inside the function.

function normalize(input_df::DataFrame, cols::Array{Int})
norm_df = input_df
for i in cols
norm_df[i] = (input_df[i] - minimum(input_df[i])) / 
(maximum(input_df[i]) - minimum(input_df[i]))
end
norm_df
end

[julia-users] Vectorized operation inside a function doesn't change a passed variable?

[AVF]

I just wanted to double-check that I understand it correctly: doing a 
vectorized operation to a passed variable inside a function will not change 
the variable on the outside? Does one have to resort to a `for` loop, or is 
there another way?

function foo!(x)

x += 10

end

 

function bar!(x)
[ x[i] += 10 for i in 1:size(x,1) ]
end

 

y = [1:3]

 

foo!(y)

println(y)

 

bar!(y)

println(y)


Output:

[1,2,3]

[1,2,3]

[11,12,13]


Thanks. 

[julia-users] Allowing keywords in function calls without default values

[AVF]

I want to write a function foo(x, y, z, many_more), which I could call as 
foo(1, 
2, 3, 5) or foo(1, 2, 3, many_more=5), but I don't want to have to supply a 
default value for many_more in my function's definition. I just want to 
have the option of not remembering the positions of x...many_more without 
required having default values for them.

Is that currently possible? Thanks...

[julia-users] Distances colwise issue, broadcasting question

[AVF]

On Friday afternoon, this code was working:

using Distances

a = rand(10,2)
b = rand(10,2)

colwise(Euclidean(), a', b')

Tonight it's not:

`colwise` has no method matching colwise(::Euclidean, ::Array{Float64,2}, 
::Array{Float64,2})


 I did run Pkg.update() in between, so maybe something changed?

Also, is there a way yet to do broadcasting? I.e. comparing a point pt = 
rand(1, 2) to an array a = rand(10, 2)? Thanks...

[julia-users] Re: IJulia indentation issue, custom.css question

[AVF]

Thanks. I definitely found a way how to break indentation, but couldn't 
figure out how to fix it. Or how to create a special class of highlighted 
words that follow "function".

I see that if I write blah[] and press Enter after the first bracket, it 
will result in:

blah[
$
]

... with the cursor sitting where $ is (I am still in IJ notebook). The 
indentation is then respected (if I press Enter after the $ line, the next 
line is indented).

How do I make the same happen for parenthesis: ()? I want pressing Enter 
after the first parenthesis in blah() result in:

blah(
$
)


Thanks!

[julia-users] IJulia indentation issue, custom.css question

[AVF]

IJulia notebook automatically removes "custom" indentation if I type on the 
indented line. For example, in this code:

plot(
layer(twins, x="x", y="y", Geom.point, 
Theme(default_color=color("indianred"), highlight_width=0.0mm)),
layer(points, x="x", y="y", Geom.point,
Theme(default_color=color("#4C72B0")))
)

... if I start typing on one of the indented lines, it will move the text 
all the way to the left. I am guessing it assumes the text doesn't need to 
be indented, since it's not a loop, etc., but I like sometimes indenting in 
such cases. Is there a way to turn this "feature" off?

Another question:

Also, if I want to change the color for the function name in IJulia, how do 
I do that? It doesn't seem to be different from "variable", but is there a 
file, where I can add the function name into its own category? In IPython's 
custom.css, I was able to do this:

.cm-s-ipython span.cm-def { color: #A52A2A; font-weight: normal; }

Thanks!

[julia-users] Re: Gadfly: adding plots to an existing plot

[AVF]

Thanks!

On Wednesday, December 31, 2014 8:25:47 PM UTC-6, Daniel Jones wrote:
>
> My mistake, it should work with append! instead of push!.
>
> For your second question, here's one option:
> a, b, c, d = [rand(10) for _ in 1:4]
>
> On Wednesday, December 31, 2014 5:58:15 PM UTC-8, AVF wrote:
>>
>> Sorry, doesn't seem to work:
>>
>> a = rand(10)
>>
>> b = rand(10)
>>
>> c = rand(10)
>>
>> d = rand(10)
>>
>>
>> p = plot(x=a, y=b)
>>
>> push!(p.layers, layer(x=c, y=d))
>>
>> `convert` has no method matching convert(::Type{Layer}, ::Array{Layer,1})
>> while loading In[185], in expression starting on line 9
>>
>>  in push! at array.jl:457
>>
>>
>> As an aside, is there a way to do something like:
>>
>> [a b c d] = rand(10,4)
>>
>>  
>>
>>
>> On Wednesday, December 31, 2014 11:01:36 AM UTC-6, Daniel Jones wrote:
>>>
>>>
>>> It's not really supported. Adding a "push!" function to add layers to 
>>> plots was proposed (https://github.com/dcjones/Gadfly.jl/issues/332), 
>>> but I haven't done so yet. In fact, adding layers to a plot p will usually 
>>> work with "push!(p.layers, layer(...))", but that's kind of an unofficial 
>>> solution.
>>>
>>

[julia-users] Re: Gadfly: adding plots to an existing plot

[AVF]

Sorry, doesn't seem to work:

a = rand(10)

b = rand(10)

c = rand(10)

d = rand(10)


p = plot(x=a, y=b)

push!(p.layers, layer(x=c, y=d))

`convert` has no method matching convert(::Type{Layer}, ::Array{Layer,1})
while loading In[185], in expression starting on line 9

 in push! at array.jl:457


As an aside, is there a way to do something like:

[a b c d] = rand(10,4)

 


On Wednesday, December 31, 2014 11:01:36 AM UTC-6, Daniel Jones wrote:
>
>
> It's not really supported. Adding a "push!" function to add layers to 
> plots was proposed (https://github.com/dcjones/Gadfly.jl/issues/332), but 
> I haven't done so yet. In fact, adding layers to a plot p will usually work 
> with "push!(p.layers, layer(...))", but that's kind of an unofficial 
> solution.
>

[julia-users] Re: Gadfly: adding plots to an existing plot

[AVF]

So, if I created a plot in a block of code, and then want to add another 
array of data to it in another block of code, is that possible? (I.e., I 
find it inconvenient that I have only one chance to plot all the layers... 
or did I misunderstand how it works?)

[julia-users] Re: Kernel restaring issue, ZMQ build error

[AVF]

Installing g++ solved the problem.

On Saturday, December 27, 2014 7:04:31 PM UTC-6, AVF wrote:
>
> I have the IJulia kernel restarting issue that, based on my search, was 
> supposed to have been resolved. After I start IJulia notebook, kernel keeps 
> restarting every few seconds. I am running Julia on Linux Mint 17.1. The 
> issue seems to be linked to ZMQ.
>
> Error from running IJulia notebook:
>
> 2014-12-27 18:53:27.031 [NotebookApp] KernelRestarter: restarting kernel 
>> (1/5)
>> WARNING:root:kernel 5a345da2-dbf7-4388-b69e-1074add0e8bb restarted
>> ERROR: could not open file /home/alex/.julia/v0.3/ZMQ/src/../deps/deps.jl
>>  in include at ./boot.jl:245
>>  in include_from_node1 at ./loading.jl:128
>>  in include at ./boot.jl:245
>>  in include_from_node1 at ./loading.jl:128
>>  in reload_path at loading.jl:152
>>  in _require at loading.jl:67
>>  in require at loading.jl:51
>>  in include at ./boot.jl:245
>>  in include_from_node1 at ./loading.jl:128
>>  in include at ./boot.jl:245
>>  in include_from_node1 at loading.jl:128
>>  in process_options at ./client.jl:285
>>  in _start at ./client.jl:354
>> while loading /home/alex/.julia/v0.3/ZMQ/src/ZMQ.jl, in expression 
>> starting on line 6
>> while loading /home/alex/.julia/v0.3/IJulia/src/IJulia.jl, in expression 
>> starting on line 13
>> while loading /home/alex/.julia/v0.3/IJulia/src/kernel.jl, in expression 
>> starting on line 4
>
>
> Pkg.update() results in:
>
> INFO: Updating METADATA...
>> INFO: Computing changes...
>> INFO: No packages to install, update or remove
>
>
>  Finally:
>
> julia> Pkg.build("ZMQ")
> INFO: Building ZMQ
> INFO: Attempting to Create directory 
> /home/alex/.julia/v0.3/ZMQ/deps/downloads
> INFO: Directory /home/alex/.julia/v0.3/ZMQ/deps/downloads already created
> INFO: Downloading file http://download.zeromq.org/zeromq-3.2.4.tar.gz
> INFO: Done downloading file http://download.zeromq.org/zeromq-3.2.4.tar.gz
> INFO: Attempting to Create directory /home/alex/.julia/v0.3/ZMQ/deps/src
> INFO: Directory /home/alex/.julia/v0.3/ZMQ/deps/src already created
> INFO: Attempting to Create directory /home/alex/.julia/v0.3/ZMQ/deps
> INFO: Directory /home/alex/.julia/v0.3/ZMQ/deps already created
> INFO: Attempting to Create directory 
> /home/alex/.julia/v0.3/ZMQ/deps/src/zeromq-3.2.4
> INFO: Directory /home/alex/.julia/v0.3/ZMQ/deps/src/zeromq-3.2.4 already 
> created
> INFO: Attempting to Create directory 
> /home/alex/.julia/v0.3/ZMQ/deps/builds/zmq
> INFO: Directory /home/alex/.julia/v0.3/ZMQ/deps/builds/zmq already created
> INFO: Changing Directory to /home/alex/.julia/v0.3/ZMQ/deps/builds/zmq
> checking for a BSD-compatible install... /usr/bin/install -c
> checking whether build environment is sane... yes
> checking for a thread-safe mkdir -p... /bin/mkdir -p
> checking for gawk... gawk
> checking whether make sets $(MAKE)... yes
> checking how to create a ustar tar archive... gnutar
> checking whether make supports nested variables... yes
> checking for gcc... gcc
> checking whether the C compiler works... yes
> checking for C compiler default output file name... a.out
> checking for suffix of executables... 
> checking whether we are cross compiling... no
> checking for suffix of object files... o
> checking whether we are using the GNU C compiler... yes
> checking whether gcc accepts -g... yes
> checking for gcc option to accept ISO C89... none needed
> checking for style of include used by make... GNU
> checking dependency style of gcc... gcc3
> checking for gcc option to accept ISO C99... -std=gnu99
> checking for g++... no
> checking for c++... no
> checking for gpp... no
> checking for aCC... no
> checking for CC... no
> checking for cxx... no
> checking for cc++... no
> checking for cl.exe... no
> checking for FCC... no
> checking for KCC... no
> checking for RCC... no
> checking for xlC_r... no
> checking for xlC... no
> checking whether we are using the GNU C++ compiler... no
> checking whether g++ accepts -g... no
> checking dependency style of g++... none
> checking whether gcc -std=gnu99 and cc understand -c and -o together... yes
> checking for a sed that does not truncate output... /bin/sed
> checking for gawk... (cached) gawk
> checking for xmlto... no
> checking for asciidoc... no
> checking build system type... x86_64-unknown-linux-gnu
> checking host system type... x86_64-unknown-linux-gnu
> checking how to print strings... printf
> checking for a sed that does not truncate output... (cached) /bin/sed
> checking for grep that handles long lines and -e... /bin/grep
> checking for egrep... /bin/gr

[julia-users] Kernel restaring issue, ZMQ build error

[AVF]

I have the IJulia kernel restarting issue that, based on my search, was 
supposed to have been resolved. After I start IJulia notebook, kernel keeps 
restarting every few seconds. I am running Julia on Linux Mint 17.1. The 
issue seems to be linked to ZMQ.

Error from running IJulia notebook:

2014-12-27 18:53:27.031 [NotebookApp] KernelRestarter: restarting kernel 
> (1/5)
> WARNING:root:kernel 5a345da2-dbf7-4388-b69e-1074add0e8bb restarted
> ERROR: could not open file /home/alex/.julia/v0.3/ZMQ/src/../deps/deps.jl
>  in include at ./boot.jl:245
>  in include_from_node1 at ./loading.jl:128
>  in include at ./boot.jl:245
>  in include_from_node1 at ./loading.jl:128
>  in reload_path at loading.jl:152
>  in _require at loading.jl:67
>  in require at loading.jl:51
>  in include at ./boot.jl:245
>  in include_from_node1 at ./loading.jl:128
>  in include at ./boot.jl:245
>  in include_from_node1 at loading.jl:128
>  in process_options at ./client.jl:285
>  in _start at ./client.jl:354
> while loading /home/alex/.julia/v0.3/ZMQ/src/ZMQ.jl, in expression 
> starting on line 6
> while loading /home/alex/.julia/v0.3/IJulia/src/IJulia.jl, in expression 
> starting on line 13
> while loading /home/alex/.julia/v0.3/IJulia/src/kernel.jl, in expression 
> starting on line 4


Pkg.update() results in:

INFO: Updating METADATA...
> INFO: Computing changes...
> INFO: No packages to install, update or remove


 Finally:

julia> Pkg.build("ZMQ")
INFO: Building ZMQ
INFO: Attempting to Create directory 
/home/alex/.julia/v0.3/ZMQ/deps/downloads
INFO: Directory /home/alex/.julia/v0.3/ZMQ/deps/downloads already created
INFO: Downloading file http://download.zeromq.org/zeromq-3.2.4.tar.gz
INFO: Done downloading file http://download.zeromq.org/zeromq-3.2.4.tar.gz
INFO: Attempting to Create directory /home/alex/.julia/v0.3/ZMQ/deps/src
INFO: Directory /home/alex/.julia/v0.3/ZMQ/deps/src already created
INFO: Attempting to Create directory /home/alex/.julia/v0.3/ZMQ/deps
INFO: Directory /home/alex/.julia/v0.3/ZMQ/deps already created
INFO: Attempting to Create directory 
/home/alex/.julia/v0.3/ZMQ/deps/src/zeromq-3.2.4
INFO: Directory /home/alex/.julia/v0.3/ZMQ/deps/src/zeromq-3.2.4 already 
created
INFO: Attempting to Create directory 
/home/alex/.julia/v0.3/ZMQ/deps/builds/zmq
INFO: Directory /home/alex/.julia/v0.3/ZMQ/deps/builds/zmq already created
INFO: Changing Directory to /home/alex/.julia/v0.3/ZMQ/deps/builds/zmq
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for a thread-safe mkdir -p... /bin/mkdir -p
checking for gawk... gawk
checking whether make sets $(MAKE)... yes
checking how to create a ustar tar archive... gnutar
checking whether make supports nested variables... yes
checking for gcc... gcc
checking whether the C compiler works... yes
checking for C compiler default output file name... a.out
checking for suffix of executables... 
checking whether we are cross compiling... no
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether gcc accepts -g... yes
checking for gcc option to accept ISO C89... none needed
checking for style of include used by make... GNU
checking dependency style of gcc... gcc3
checking for gcc option to accept ISO C99... -std=gnu99
checking for g++... no
checking for c++... no
checking for gpp... no
checking for aCC... no
checking for CC... no
checking for cxx... no
checking for cc++... no
checking for cl.exe... no
checking for FCC... no
checking for KCC... no
checking for RCC... no
checking for xlC_r... no
checking for xlC... no
checking whether we are using the GNU C++ compiler... no
checking whether g++ accepts -g... no
checking dependency style of g++... none
checking whether gcc -std=gnu99 and cc understand -c and -o together... yes
checking for a sed that does not truncate output... /bin/sed
checking for gawk... (cached) gawk
checking for xmlto... no
checking for asciidoc... no
checking build system type... x86_64-unknown-linux-gnu
checking host system type... x86_64-unknown-linux-gnu
checking how to print strings... printf
checking for a sed that does not truncate output... (cached) /bin/sed
checking for grep that handles long lines and -e... /bin/grep
checking for egrep... /bin/grep -E
checking for fgrep... /bin/grep -F
checking for ld used by gcc -std=gnu99... /usr/bin/ld
checking if the linker (/usr/bin/ld) is GNU ld... yes
checking for BSD- or MS-compatible name lister (nm)... /usr/bin/nm -B
checking the name lister (/usr/bin/nm -B) interface... BSD nm
checking whether ln -s works... yes
checking the maximum length of command line arguments... 1572864
checking whether the shell understands some XSI constructs... yes
checking whether the shell understands "+="... yes
checking how to convert x86_64-unknown-linux-gnu file names to 
x86_64-unknown-linux-gnu format... func_convert_file_noop
checking how to convert x86_64-unknown-linux-gnu file names to toolchai