[julia-users] Convert a string with commas into a float
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?
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] Allowing keywords in function calls without default values
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] Vectorized operation inside a function doesn't change a passed variable?
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] Distances colwise issue, broadcasting question
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
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] Re: Gadfly: adding plots to an existing plot
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] IJulia indentation issue, custom.css question
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
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: Gadfly: adding plots to an existing plot
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] Kernel restaring issue, ZMQ build error
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 toolchain format...
[julia-users] Re: Kernel restaring issue, ZMQ build error
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/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
