[Scilab-users] adjust image

[Philipp Mühlmann]

Dear all,

please have a look at following code.

The aim is to adjust the intensitivity levels of an image to new
values...something like imadjust in Matlab.

I did not find something like this in IPD or in SIVP, therefore the try.

For my purposes it's enough, though not all image types are maybe
supported...

But the code did work with a bmp and jpg-file.


function out=AdjustImage(img, In_low, In_high, Out_low, Out_high)

//make sure we work with doubles
img = double(img);

select ndims(img)
case 2 // 2D array (GrayScaleImage)
//normalize image
MIN = min(img);
MAX = max(img);
img = (img-MIN)./ (MAX-MIN);
//make sure img is in the range [In_low;In_high]
img =  max(In_low, min(In_high,img));
out = ( (img - In_low) ./ (In_high - In_low) ) ;
out = out .* (Out_high - Out_low) + Out_low;
case 3 // hypermat (ColorImage)
for i = 1:3
//normalize image
MIN = min(img(:,:,i));
MAX = max(img(:,:,i));
img(:,:,i) = (img(:,:,i)-MIN)./ (MAX-MIN);
//make sure img is in the range [In_low;In_high]
img(:,:,i) =  max(In_low, min(In_high,img(:,:,i)));
out(:,:,i) = ((img(:,:,i) - In_low) ./ (In_high - In_low)) ;
out(:,:,i) = out(:,:,i) .* (Out_high - Out_low) + Out_low;
end
endendfunction;


//test case 2D

img = rand(240,320);
adj_im = AdjustImage(img,0.2,0.8,0,1);



//test case hypermat

img(:,:,1) = rand(240,320);
img(:,:,2) = rand(240,320);
img(:,:,3) = rand(240,320);
adj_im = AdjustImage(img,0.2,0.8,0,1);

For those who have IPD installed, you can use ShowImage() or
ShowColorImage() to see the results.

For those who don't at least the 2D case should be possible to
visualize with Matplot()...the hypermat case...don't know.


f = figure();
f.color_map = graycolormap(255);
Matplot(img);



BR,
Philipp











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Re: [Scilab-users] Plotting as stem function

[Chema]

Thanks, the two answers were usefull for me...



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[Scilab-users] usage of libsvm

[Y. Noguchi]

Dear Scilab Users


I would like to lean how to use libsvm  Toolbox - (1.4.5).
I would like to do multi variable regression by using this tool box.

If you have any tutrial material for beginner of this tool box, could you 
please please send it to me.

Thank you for your help.


Y. Noguchi

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[Scilab-users] usage of libsvm Toolbox

[noguchi]

Dear Scilab Users


I would like to lean how to use libsvm  Toolbox - (1.4.5).
I would like to do multi variable regression by using this tool box.

If you have any tutrial material with sample data for beginner of this tool
box, could you please please send it to me.

Especially, I would like to know that how I can know the regression equation
and their parameters so that I can implement it in the computer to calculate
the predicted value on-line.

Thank you for your help.


Y. Noguchi



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Re: [Scilab-users] new option "@" <= uman : help in the console, with language switch, automatic redirections, related online pages.

[Samuel Gougeon]

Le 22/02/2016 13:13, Samuel Gougeon a écrit :

.../...
 uman denizet>SEP|graphics! @  // Subject with ("SEP" OR "graphics") 
FROM Denizet
 uman SEPSEP! @  // Subject with "SEP" FROM ("Steer" OR 
"Couvert")


in order to use the trailing "<###" to specify the number of most recent 
days within which messages were posted.

It will be added to the forthcoming release.

SG

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Re: [Scilab-users] new option "@" <= uman : help in the console, with language switch, automatic redirections, related online pages.

[Samuel Gougeon]

Hello Rafael,

Le 22/11/2015 22:47, Rafael Guerra a écrit :


Hello Samuel,

Thanks for sharing *uman* and congratulations for the amazing work done.

This is a very useful tool to increase Scilab users productivity.

The quick access to the appropriate bug webpages is awesome.

May we also use uman to query the relevant threads in Scilab users 
webpages?



.
Thanks for using and supporting *uman*.

The present release for Scilab 6 is out of work due to Scilab 6 running 
changes,
but the next uman's release will come very soon, for both Scilab 5 and 
Scilab 6.
It will propose the new option "*@*" (and other new features) to do what 
you wish.
Here is how "@" is presently implemented (examples from the help page, 
all already

working):

 // Mailing lists: Search Scilab online archives: The "@" option
 // 
 // To search only in Subject of messages, end the pattern with "!"
 // Operators grouping (), | (or), & (and), ~ (not/without) can be used.
 // If it has spaces or a leading ( , put the pattern between quotes "..."
 // Author(s) may be also be selected with "author>..." or "......" etc.
 //
 uman aliasing @// Search "aliasing" in any part of messages
 uman aliasing! @   // Search "aliasing" only in Subjects
 uman grand @   // Messages with "grand" AND "setting" in any part
 uman grand&~setting @  // Messages with "grand" AND WITHOUT "setting" 
in any part

 uman "grand & ~setting" @  // idem. Use quotes when there are blanks.
 uman cell|struct! @// Subject with "cell" OR "struct"
 uman "(cell|struct)&~matrix!" @ // Subject with "cell" OR "struct", 
AND NOT matrix
 // Quotes are mandatory to protect the 
leading (
 uman struct&~(array|scilab)! @  // Subject with "struct" AND NOT 
("array" OR "scilab")
 uman "(cell|struct)&~(function|array)!" @  // Subject with "cell" OR 
"struct",

 //   AND NOT "function" OR "array"
 uman denizet>SEP|graphics! @  // Subject with ("SEP" OR "graphics") 
FROM Denizet
 uman SEP

Re: [Scilab-users] ?==?utf-8?q? ?==?utf-8?q? ?= How to replicate what "load" does (aka creating variable in the current workspace from inside a function)

[Antoine Monmayrant]

> Not sure if it is related to `who` or to the special use of `resume`.

I can confirm that it comes from the bug in who for scilab 6.0.
See also my solution that uses 'resume' and not 'who' and work in both 5.5 and 
6.0

Cheers,

Antoine


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Re: [Scilab-users] How to replicate what "load" does (aka creating variable in the current workspace from inside a function)

[Samuel Gougeon]

Le 22/02/2016 12:12, Antoine Monmayrant a écrit : Le Lundi 22 Février 
2016 12:04 CET, "Antoine Monmayrant"  a écrit:

  Le Lundi 22 Février 2016 11:51 CET, Serge Steer  a 
écrit:

The following function does the job:

function myload()
txt=["a=1";"b=2"];
ncur= size(who("local"),"*")
execstr(txt);
vars=who("local");
vars=vars(1:size(vars,'*')-ncur-1)
args=strcat(vars,",")
execstr("["+args+"]=resume("+args+")")
endfunction

Thank you Serge!
It does work on 5.5.0, but it does not work on 6.6.0-beta1.
It might be due to the way variables are ordered when calling "who".

OK, it seems that "who" no longer list variables with the most recent at the 
top, but in alphabetical order.

.
You can use setdiff() to get the names of the new variables, knowing the 
former set, whatever is their order.
Then, you will need to the same before and after calling the function, 
to get the unknown names of returned variables.


Samuel

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Re: [Scilab-users] ?==?utf-8?q? ?==?utf-8?q? ?= How to replicate what "load" does (aka creating variable in the current workspace from inside a function)

[Antoine Monmayrant]

This bug (who results are always sorted) was already reported here : 
http://bugzilla.scilab.org/show_bug.cgi?id=14352


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Re: [Scilab-users] ?==?utf-8?q? How to replicate what "load" does (aka creating variable in the current workspace from inside a function)?

[Antoine Monmayrant]

 
Le Lundi 22 Février 2016 11:51 CET, Serge Steer  a écrit: 
 
> The following function does the job:
> 
> function myload()
>txt=["a=1";"b=2"];
>ncur= size(who("local"),"*")
>execstr(txt);
>vars=who("local");
>vars=vars(1:size(vars,'*')-ncur-1)
>args=strcat(vars,",")
>execstr("["+args+"]=resume("+args+")")
> endfunction

Thank you Serge!
It does work on 5.5.0, but it does not work on 6.6.0-beta1.
It might be due to the way variables are ordered when calling "who".

Cheers,

Antoine


> 
> Serge
> Le 22/02/2016 11:21, Antoine Monmayrant a écrit :
> > Hi all,
> >
> > I need to create variables dynamically depending on what I parse from a 
> > text file.
> > For testing, I just made a simple script that parses the file and generates 
> > a string array that defines some variables:
> >  txt=["a=1";"b=2"];
> > I then
> >  execstr(txt);;
> > to create the variables needed (here "a" and "b").
> > So far, so good.
> > Now, I need to refactor my code to turn my messy script into a proper set 
> > of functions (see example code below).
> > The issue now is that I can't figure out how to define "a" and "b" from 
> > within the function.
> > I tried to declare them as "global" inside the function, but it does not 
> > work: as I haven't  declared them global at the top level before calling my 
> > function, it cannot work.
> > Sadly, as I don't know in advance the variables I'll find when I parse the 
> > file, I cannot declare the variables global at the top level.
> >
> > Any solution or workaround?
> >
> > Cheers,
> >
> > Antoine
> >
> > /example code
> >
> > //script version:
> >
> > clear a b;
> > exists("a")// nope
> > exists("b")// nope
> > txt=["a=1";"b=2"];//typical result from parsing my txt file
> > execstr(txt);
> > exists("a")// yes
> > exists("b")// yes
> >
> > //now with a function
> >
> > //broken & useless
> > function myload()
> >  txt=["a=1";"b=2"];
> >  //string to declare a and b global
> >  globaltxt="global "+strsubst(txt, '/=.*/', ';','r');
> >  //does not work
> >  execstr(globaltxt);
> >  execstr(txt);
> > endfunction
> >
> >
> > //does not work
> > clear a b;
> > exists("a")// nope
> > exists("b")// nope
> > myload()//
> > exists("a")// nope
> > exists("b")// nope
> >
> >
> > //this will work
> > clear a b
> > exists("a")// nope
> > exists("b")// nope
> > global a b // well I can't do that in practice, I don't know a and b in 
> > advance
> > myload()//
> > exists("a")// nope
> > exists("b")// nope
> >
> >
> >
> > ___
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> > users@lists.scilab.org
> > http://lists.scilab.org/mailman/listinfo/users
> >
> 
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> 
 
 
 
 


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Re: [Scilab-users] How to replicate what "load" does (aka creating variable in the current workspace from inside a function)?

[Serge Steer]

The following function does the job:

function myload()
  txt=["a=1";"b=2"];
  ncur= size(who("local"),"*")
  execstr(txt);
  vars=who("local");
  vars=vars(1:size(vars,'*')-ncur-1)
  args=strcat(vars,",")
  execstr("["+args+"]=resume("+args+")")
endfunction

Serge
Le 22/02/2016 11:21, Antoine Monmayrant a écrit :

Hi all,

I need to create variables dynamically depending on what I parse from a text 
file.
For testing, I just made a simple script that parses the file and generates a 
string array that defines some variables:
 txt=["a=1";"b=2"];
I then
 execstr(txt);;
to create the variables needed (here "a" and "b").
So far, so good.
Now, I need to refactor my code to turn my messy script into a proper set of 
functions (see example code below).
The issue now is that I can't figure out how to define "a" and "b" from within 
the function.
I tried to declare them as "global" inside the function, but it does not work: 
as I haven't  declared them global at the top level before calling my function, it cannot 
work.
Sadly, as I don't know in advance the variables I'll find when I parse the 
file, I cannot declare the variables global at the top level.

Any solution or workaround?

Cheers,

Antoine

/example code

//script version:

clear a b;
exists("a")// nope
exists("b")// nope
txt=["a=1";"b=2"];//typical result from parsing my txt file
execstr(txt);
exists("a")// yes
exists("b")// yes

//now with a function

//broken & useless
function myload()
 txt=["a=1";"b=2"];
 //string to declare a and b global
 globaltxt="global "+strsubst(txt, '/=.*/', ';','r');
 //does not work
 execstr(globaltxt);
 execstr(txt);
endfunction


//does not work
clear a b;
exists("a")// nope
exists("b")// nope
myload()//
exists("a")// nope
exists("b")// nope


//this will work
clear a b
exists("a")// nope
exists("b")// nope
global a b // well I can't do that in practice, I don't know a and b in advance
myload()//
exists("a")// nope
exists("b")// nope



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[Scilab-users] How to replicate what "load" does (aka creating variable in the current workspace from inside a function)?

[Antoine Monmayrant]

Hi all,

I need to create variables dynamically depending on what I parse from a text 
file.
For testing, I just made a simple script that parses the file and generates a 
string array that defines some variables:
txt=["a=1";"b=2"];
I then 
execstr(txt);;
to create the variables needed (here "a" and "b").
So far, so good.
Now, I need to refactor my code to turn my messy script into a proper set of 
functions (see example code below).
The issue now is that I can't figure out how to define "a" and "b" from within 
the function.
I tried to declare them as "global" inside the function, but it does not work: 
as I haven't  declared them global at the top level before calling my function, 
it cannot work.
Sadly, as I don't know in advance the variables I'll find when I parse the 
file, I cannot declare the variables global at the top level.

Any solution or workaround?

Cheers,

Antoine

/example code

//script version:

clear a b;
exists("a")// nope
exists("b")// nope
txt=["a=1";"b=2"];//typical result from parsing my txt file
execstr(txt);
exists("a")// yes
exists("b")// yes

//now with a function

//broken & useless 
function myload()
txt=["a=1";"b=2"];
//string to declare a and b global
globaltxt="global "+strsubst(txt, '/=.*/', ';','r');
//does not work
execstr(globaltxt);
execstr(txt);
endfunction


//does not work
clear a b;
exists("a")// nope
exists("b")// nope
myload()//
exists("a")// nope
exists("b")// nope


//this will work
clear a b
exists("a")// nope
exists("b")// nope
global a b // well I can't do that in practice, I don't know a and b in advance
myload()//
exists("a")// nope
exists("b")// nope



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