Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

New help in contourf matlab

  1. Feb 12, 2015 #1
    %gamma=20;
    gamma=580;
    %P=0.1;
    P=0.75;
    N=P.*gamma;
    lamdazero=1550;
    [lamdapump,lamdasignal] = meshgrid(1550:0.1:1700,1550:0.1:1700);
    beta3=1.3;
    beta4=-8*10^-4;
    %beta3=0.06;
    %beta4=-2*10^-4;
    c=2*pi*3*10^8;
    %L=1;
    L=0.01;
    A0=(1./lamdapump) -(1./lamdazero);
    B0=(1./lamdapump) -(1./lamdasignal);
    %Linearmismatch=beta2.*c.^2.*(B0).^2;
    %beta2=(6*pi.*10^5.*beta3.*A0) +(0.5.*beta4.*A0.^2).*(6.*pi.*10^5)^2;
    %Second0=(1./2).*beta2.*(c.^2).*(B0.^2);
    Third0=10^-9.*beta3.*(c.^3).*A0.*(B0.^2);
    Fourth0=10^-12.*beta4.*(1./2).*c.^4.*(A0.^2).*(B0.^2);
    %S4=(10^-12/12).*beta4.*c.^4*(B0.^4);
    Fourorder=(10^-12).*c.^4.*beta4.*(1/12).*(B0).^4;
    g0=1.1*10^-11;
    Aeff=11*10^-12;
    PSBS=0.025;
    %g0=3.9*10^-9;
    %Aeff=14*10^-12;
    %PSBS=0.005;
    SBS=(g0.*PSBS.*1000)./Aeff ;
    deltabeta=Third0+Fourth0+Fourorder;
    hold on
    for i=1:1:length(deltabeta)
    for j=1:1:length(deltabeta)
    if(deltabeta(i,j)>=0 || deltabeta(i,j)<=(-4*N))
    test(i,j)=NaN;
    else
    test(i,j)=deltabeta(i,j);
    end
    end
    end
    contourf(lamdapump,lamdasignal,test,'ShowText','off');
    cmap=[0,0,0];
    colormap=cmap;
    colorbar
    h = colorbar;
    set(get(h,'title'),'string','\Delta \beta (\gamma P)');
    ax = findobj('type','axes');
    %set(ax(1),'ytickl',{'-5172.4', '-4310.3', '-3448.3', '-2586.2', '-1724.1',' -862.1', '0', '862.1', '1724.1'})
    xlabel('\lambda_p_u_m_p')
    ylabel('\lambda_s_i_g_n_a_l')
    title('Contour representing linear phase mismatch for FWM pump power 75 mW and SBS pump power 25 mW ')

    Hello everyone I am new here and have small experience with matlab and would like some help. So when you execute this code you would see a curve I want this curve to be one color only. Any help with that? Because I would love to retain the original plot without removing points to get that curve. One more thing, I was wondering that if I want to add a condition or in other words a black color (since no black is in my color bar) like if deltabeta=-2 gamma P make deltabeta black colored is it possible Sorry for making you guys read that long. Thank you and looking forward to reading your reply. el-abed
     
  2. jcsd
  3. Feb 15, 2015 #2

    kreil

    User Avatar
    Gold Member

    For starters, you make built-in MATLAB functions into variables in several places here.

    Code (Text):
    gamma=580;
    colormap=cmap;
    Both of these commands will override the MATLAB built-in functions. Don't do this, just use different variable names that don't conflict.

    Once you use different variable names, you can set the colormap to whatever you want.

    http://www.mathworks.com/help/matlab/ref/colormap.html
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: New help in contourf matlab
  1. New MATLAB User (Replies: 4)

  2. MATLAB help (Replies: 0)

  3. MATLAB help (Replies: 7)

  4. Matlab help (Replies: 6)

Loading...