matlab - Plot black and white mandelbrot set -

-

below code taken here.

i trying make following change code below

if c not part of set, plot white pixel, , if part of set, plot black pixel.

i getting output: enter image description here

but want plot black , white mandelbrot image this:

enter image description here

use imshow command plot image

can ?

    m=601;      n=401;     count_max = 200;    %change range of x's , y's here    x_max =   1;   x_min = - 2;   y_max =   1;   y_min = - 1;  % %  create array of complex sample points in [x_min,x_max] + [y_min,y_max]*i. %   = ( 1 : m );   j = ( 1 : n );   x = ( ( - 1 ) * x_max + ( m - ) * x_min ) / ( m - 1 );   y = ( ( j - 1 ) * y_max + ( n - j ) * y_min ) / ( n - 1 );   [ zr, zi ] = meshgrid ( x, y );   c = complex ( zr, zi ); % %  carry out iteration. %   epsilon = 0.001;    z = c;   ieps = 1 : numel ( c );    %iterate through 1 maximum no. of iterations   = 1 : count_max     z(ieps) = z(ieps) .* z(ieps) + c(ieps);      w(ieps) = exp ( - abs ( z(ieps) ) );     ieps = ieps ( find ( epsilon < w(ieps) ) );   end % %  display data. %   d = log ( abs ( z ) );   t = delaunay ( zr, zi ); % %  see individual pixels, use 'flat' color. %  h = trisurf ( t, zr, zi, d, 'facecolor', 'flat', 'edgecolor', 'flat' ); %  h = trisurf ( t, zr, zi, d, 'facecolor', 'interp', 'edgecolor', 'interp' );    view ( 2 )   axis equal   axis on   title_string = sprintf ( 'mandelbrot set, %d x %d pixels, %d iterations', ...     m, n, count_max );   title ( title_string )   xlabel ('real axis');   ylabel ('imaginary axis'); %  terminate.

the difference of belonging set , not belonging set nothing else epsilon < w(ieps) , using in code. colorinformation in plot coming fourth argument of trisurf ( t, zr, zi, d,...).

so suggest following before trisurf command:

d(1 : numel ( c )) = 1; d(ieps) = 0;

this first sets elements 1 , sets elements 0 part of set, according condition calculated in last iteration of convergence test.

to plot black , white, use colormap gray after trisurf.

hope helps.


Comments

Post a Comment

Popular posts from this blog

Why does Go error when trying to marshal this JSON? -

-
i'm trying rather simple example of trying decode json file structs using golang. however, when attempting error that json: cannot unmarshal object go value of type []main.track which don't understand. here's code in question, , json can found here . package main import ( "encoding/json" "fmt" "net/http" "os" ) // tracks group of track types type tracks struct { tracks []track } // track represents singular track type track struct { name string url string artist artist } // artist represents single artist type artist struct { name string mbid string url string } func main() { url := "http://ws.audioscrobbler.com/2.0/?method=geo.gettoptracks&api_key=c1572082105bd40d247836b5c1819623&format=json&country=netherlands" response, err := http.get(url) if err != nil { fmt.printf("%s\n", err) os.exit(1) } de
Read more

Django REST Framework perform_create: You cannot call `.save()` after accessing `serializer.data` -

-
i have following viewset: class artistprofileviewset(viewsets.modelviewset): queryset = artistprofile.objects.all() serializer_class = artistprofileserializer def perform_create(self, serializer): if serializer.is_valid(): serializer.save() with following serializers: class simpleartisttrackserializer(serializers.hyperlinkedmodelserializer): class meta: model = artisttrack fields = (...my fields...) class artistprofileserializer(serializers.hyperlinkedmodelserializer): owners = userserializer(many=true, required=false) tracks = simpleartisttrackserializer(many=true, required=false) class meta: model = artistprofile fields = (...my fields...) i getting following error: assertionerror: cannot call `.save()` after accessing `serializer.data`.if need access data before committing database inspect 'serializer.validated_data' instead. i don't see editing serializer.data object. th
Read more

apache - Restler setup not working -

-
on webserver running apache/2.2.26 (unix) dav/2 php/5.4.24 mod_ssl/2.2.26 openssl/0.9.8y trying setup restler can't seem handle index.php properly. webapp setup httpd.conf looks so: alias "/dts2" "/usr/local/webapps/dts/root" <directory "/usr/local/webapps/dts/root"> allowoverride options -indexes followsymlinks </directory> so went 'root' directory , ran command install restler: composer create-project restler/application=dev-basic api --prefer-dist after that, in 'api' directory created .htaccess file looks so: directoryindex index.php <ifmodule mod_rewrite.c> rewriteengine on rewriterule ^$ public/index.php [qsa,l] rewritecond %{request_filename} !-f rewritecond %{request_filename} !-d rewriterule ^(.*)$ public/index.php [qsa,l] </ifmodule> <ifmodule mod_php5.c> php_flag display_errors on </ifmodule> and, when try access " https://..../dts2/api/home/ &
Read more