Re: [julia-users] Re: How to feval?
This will not be fast. It's also wildly insecure if the string come from an
external source. I'd strongly recommend figuring out a different approach
to what you're doing, but it's hard to provide guidance without more
context.
On Thu, Oct 22, 2015 at 12:34 PM, Alex Ames
wrote:
> You could define your own feval:
>
> feval(fn_str, args...) = eval(parse(fn_str))(args...)
>
> This has the advantage of accepting anonymous functions and multiple
> arguments if necessary:
> julia> feval("sin",5.0)
> -0.9589242746631385
>
> julia> fn_str = "a_plus_b(a,b) = a + b"
> "a_plus_b(a,b) = a + b"
>
> julia> feval(fn_str,2,3)
> 5
>
> On Thursday, October 22, 2015 at 8:20:33 AM UTC-5, J Luis wrote:
>>
>> Thanks, at least it's a place to start.
>>
>> quinta-feira, 22 de Outubro de 2015 às 14:10:44 UTC+1, Kristoffer
>> Carlsson escreveu:
>>>
>>> Maybe
>>>
>>> julia> eval(Symbol("sin"))(5.0)
>>> -0.9589242746631385
>>>
>>> Not sure if this is the best solution.
>>>
>>>
>>> On Thursday, October 22, 2015 at 2:57:31 PM UTC+2, J Luis wrote:
Hi,
I need to convert this piece of Matlab code
[ps, orig_path] = feval(str2func(test), out_path);
where 'test' is the name of a function and 'out_path' it unique input
argument. I have read and re-read the eval function and for once it's clear
for me how it works (sorry, I find this sentence highly cryptic "Evaluate
an expression in the given module and return the result" ) but worst, I
don't see anywhere how it could call a function with input arguments.
How can I achieve the same result in Julia?
Thanks.
>>>
Re: [julia-users] Re: How to feval?
Speed is not critical here. I am porting this script
http://gmt.soest.hawaii.edu/projects/gmt-matlab-octave-api/repository/changes/trunk/src/gmtest.m
that will call the test scripts that live, as for example, here
http://gmt.soest.hawaii.edu/projects/gmt/repository/show/branches/5.2.0/doc/scripts/ml
and compare the produced output with the reference PS file that is also in
the testing dirs.
If it works, as I hope and will test later. It's good enough for me but off
course faster alternatives are always wellcome.
Thanks
quinta-feira, 22 de Outubro de 2015 às 18:16:05 UTC+1, Stefan Karpinski
escreveu:
>
> This will not be fast. It's also wildly insecure if the string come from
> an external source. I'd strongly recommend figuring out a different
> approach to what you're doing, but it's hard to provide guidance without
> more context.
>
> On Thu, Oct 22, 2015 at 12:34 PM, Alex Ames > wrote:
>
>> You could define your own feval:
>>
>> feval(fn_str, args...) = eval(parse(fn_str))(args...)
>>
>> This has the advantage of accepting anonymous functions and multiple
>> arguments if necessary:
>> julia> feval("sin",5.0)
>> -0.9589242746631385
>>
>> julia> fn_str = "a_plus_b(a,b) = a + b"
>> "a_plus_b(a,b) = a + b"
>>
>> julia> feval(fn_str,2,3)
>> 5
>>
>> On Thursday, October 22, 2015 at 8:20:33 AM UTC-5, J Luis wrote:
>>>
>>> Thanks, at least it's a place to start.
>>>
>>> quinta-feira, 22 de Outubro de 2015 às 14:10:44 UTC+1, Kristoffer
>>> Carlsson escreveu:
Maybe
julia> eval(Symbol("sin"))(5.0)
-0.9589242746631385
Not sure if this is the best solution.
On Thursday, October 22, 2015 at 2:57:31 PM UTC+2, J Luis wrote:
>
> Hi,
>
> I need to convert this piece of Matlab code
>
> [ps, orig_path] = feval(str2func(test), out_path);
>
> where 'test' is the name of a function and 'out_path' it unique input
> argument. I have read and re-read the eval function and for once it's
> clear
> for me how it works (sorry, I find this sentence highly cryptic "Evaluate
> an expression in the given module and return the result" ) but worst, I
> don't see anywhere how it could call a function with input arguments.
>
> How can I achieve the same result in Julia?
>
> Thanks.
>
>
Re: [julia-users] Re: How to feval?
Anyway, unfortunately none of the above solutions work for files. If the
file is called "GMT_insert.jl", and is in the path, I get variations around
(+ file extension - file extension) of
ERROR: UndefVarError: GMT_insert not defined
quinta-feira, 22 de Outubro de 2015 às 18:30:04 UTC+1, J Luis escreveu:
>
> Speed is not critical here. I am porting this script
>
>
> http://gmt.soest.hawaii.edu/projects/gmt-matlab-octave-api/repository/changes/trunk/src/gmtest.m
>
> that will call the test scripts that live, as for example, here
>
>
> http://gmt.soest.hawaii.edu/projects/gmt/repository/show/branches/5.2.0/doc/scripts/ml
>
> and compare the produced output with the reference PS file that is also in
> the testing dirs.
>
> If it works, as I hope and will test later. It's good enough for me but
> off course faster alternatives are always wellcome.
>
> Thanks
>
> quinta-feira, 22 de Outubro de 2015 às 18:16:05 UTC+1, Stefan Karpinski
> escreveu:
>>
>> This will not be fast. It's also wildly insecure if the string come from
>> an external source. I'd strongly recommend figuring out a different
>> approach to what you're doing, but it's hard to provide guidance without
>> more context.
>>
>> On Thu, Oct 22, 2015 at 12:34 PM, Alex Ames
>> wrote:
>>
>>> You could define your own feval:
>>>
>>> feval(fn_str, args...) = eval(parse(fn_str))(args...)
>>>
>>> This has the advantage of accepting anonymous functions and multiple
>>> arguments if necessary:
>>> julia> feval("sin",5.0)
>>> -0.9589242746631385
>>>
>>> julia> fn_str = "a_plus_b(a,b) = a + b"
>>> "a_plus_b(a,b) = a + b"
>>>
>>> julia> feval(fn_str,2,3)
>>> 5
>>>
>>> On Thursday, October 22, 2015 at 8:20:33 AM UTC-5, J Luis wrote:
Thanks, at least it's a place to start.
quinta-feira, 22 de Outubro de 2015 às 14:10:44 UTC+1, Kristoffer
Carlsson escreveu:
>
> Maybe
>
> julia> eval(Symbol("sin"))(5.0)
> -0.9589242746631385
>
> Not sure if this is the best solution.
>
>
> On Thursday, October 22, 2015 at 2:57:31 PM UTC+2, J Luis wrote:
>>
>> Hi,
>>
>> I need to convert this piece of Matlab code
>>
>> [ps, orig_path] = feval(str2func(test), out_path);
>>
>> where 'test' is the name of a function and 'out_path' it unique input
>> argument. I have read and re-read the eval function and for once it's
>> clear
>> for me how it works (sorry, I find this sentence highly cryptic
>> "Evaluate
>> an expression in the given module and return the result" ) but worst, I
>> don't see anywhere how it could call a function with input arguments.
>>
>> How can I achieve the same result in Julia?
>>
>> Thanks.
>>
>
>>
Re: [julia-users] Re: How to feval?
Julia doesn't identify functions and files the way Matlab does. You can
just load the file by name.
On Thu, Oct 22, 2015 at 2:56 PM, J Luis wrote:
> Anyway, unfortunately none of the above solutions work for files. If the
> file is called "GMT_insert.jl", and is in the path, I get variations around
> (+ file extension - file extension) of
>
> ERROR: UndefVarError: GMT_insert not defined
>
>
>
> quinta-feira, 22 de Outubro de 2015 às 18:30:04 UTC+1, J Luis escreveu:
>>
>> Speed is not critical here. I am porting this script
>>
>>
>> http://gmt.soest.hawaii.edu/projects/gmt-matlab-octave-api/repository/changes/trunk/src/gmtest.m
>>
>> that will call the test scripts that live, as for example, here
>>
>>
>> http://gmt.soest.hawaii.edu/projects/gmt/repository/show/branches/5.2.0/doc/scripts/ml
>>
>> and compare the produced output with the reference PS file that is also
>> in the testing dirs.
>>
>> If it works, as I hope and will test later. It's good enough for me but
>> off course faster alternatives are always wellcome.
>>
>> Thanks
>>
>> quinta-feira, 22 de Outubro de 2015 às 18:16:05 UTC+1, Stefan Karpinski
>> escreveu:
>>>
>>> This will not be fast. It's also wildly insecure if the string come from
>>> an external source. I'd strongly recommend figuring out a different
>>> approach to what you're doing, but it's hard to provide guidance without
>>> more context.
>>>
>>> On Thu, Oct 22, 2015 at 12:34 PM, Alex Ames
>>> wrote:
>>>
You could define your own feval:
feval(fn_str, args...) = eval(parse(fn_str))(args...)
This has the advantage of accepting anonymous functions and multiple
arguments if necessary:
julia> feval("sin",5.0)
-0.9589242746631385
julia> fn_str = "a_plus_b(a,b) = a + b"
"a_plus_b(a,b) = a + b"
julia> feval(fn_str,2,3)
5
On Thursday, October 22, 2015 at 8:20:33 AM UTC-5, J Luis wrote:
>
> Thanks, at least it's a place to start.
>
> quinta-feira, 22 de Outubro de 2015 às 14:10:44 UTC+1, Kristoffer
> Carlsson escreveu:
>>
>> Maybe
>>
>> julia> eval(Symbol("sin"))(5.0)
>> -0.9589242746631385
>>
>> Not sure if this is the best solution.
>>
>>
>> On Thursday, October 22, 2015 at 2:57:31 PM UTC+2, J Luis wrote:
>>>
>>> Hi,
>>>
>>> I need to convert this piece of Matlab code
>>>
>>> [ps, orig_path] = feval(str2func(test), out_path);
>>>
>>> where 'test' is the name of a function and 'out_path' it unique
>>> input argument. I have read and re-read the eval function and for once
>>> it's
>>> clear for me how it works (sorry, I find this sentence highly cryptic "
>>> Evaluate an expression in the given module and return the result" )
>>> but worst, I don't see anywhere how it could call a function with input
>>> arguments.
>>>
>>> How can I achieve the same result in Julia?
>>>
>>> Thanks.
>>>
>>
>>>
