How to plot multiple figures in a for loop in matlab

l = Line[{{-2, -2, 41}, {6, 4, -10}}];

Show[{Plot3D[{2 x + 7 y}, {x, -2, 5}, {y, -2, 5},  AxesLabel -> {x, y, z}], 
      Graphics3D[{Thick, l}]}]

x = 1:2;
y = x;

f = 2;  %number of figures
c = 2;  %number of plots per column per figure
r = 2;  %number of plots per row per figure
n = repmat(cumsum(ones(1,r*c)),1,f);  %index for subplots
h = ceil( (1:f*r*c)/(r*c) ); %index of figures

for ii=1:f*r*c

   % calculations

   % plot specifier
   figure( h(ii) )
   subplot( r,c,n(ii) )

   % plot
   plot(x,y)

   % your plot properties
end

f = 3;  %number figures
c = 3;  %number of columns per figure
r = 4;  %number of rows per figure

set(0, 'currentfigure', g);

a=1:10; b=-a;
% make invisible plot window 
f = figure('visible','off');
g = figure('visible','off');

% figure makes the plot visible again    
set(0, 'currentfigure', f);
plot(a)
saveas(f,'newout','fig')

set(0, 'currentfigure', g);
plot(b)
saveas(g,'newout2','fig')

%% load saved figures
close all
openfig('newout.fig','new','visible')
openfig('newout2.fig','new','visible')

for i=1:N
    clf
    plot(...)
end