Problems definition file is complete

getProblems.m

+function [p,n] = getProblems()
+    i = 1;
+
+    p = struct;
+
+    
+    %%%%%%%%%%%%%%%%%%%%
+    %Non-stiff problems: B 
+    %%%%%%%%%%%%%%%%%%%%    
+    % B1
+    p(i).name = 'non_stiff-B1';
+    p(i).f = @(x,y) [
+        2*(y(1)-y(1)*y(2));
+        -(y(2)-y(1)*y(2))
+        ];
+    p(i).h0 = -1;
+    p(i).y0 = [1;3];
+    p(i).xSpan = [0 20];
+    
+    i = i + 1;
+    
+    % B2
+    p(i).name = 'non_stiff-B2';
+    p(i).f = @(x,y) [
+        -y(1) + y(2);
+        y(1) - 2*y(2) + y(3);
+        y(2) - y(3)
+        ];
+    p(i).h0 = -1;
+    y0 = [2;0;1];
+    xSpan = [0 20];
+    
+    i = i + 1;
+    
+    % B3
+    p(i).name = 'non_stiff-B3';
+    p(i).f = @(x,y) [
+        -y(1);
+        y(1) - y(2)^2;
+        y(2)^2
+        ];
+    p(i).h0 = -1;
+    y0 = [2;0;1];
+    xSpan = [0 20];
+    
+    i = i + 1;
+    
+    % return value
+    n = i-1;
+    
+    % B4 
+    p(i).name = 'non_stiff-B4';
+    p(i).f = @(x,y) [
+        -y(2)-y(1)*y(3)/((y(1)^2+y(2)^2)^(1/2));
+        y(1) - y(2)*y(3)/((y(1)^2+y(2)^2)^(1/2));
+        y(1)/((y(1)^2+y(2)^2)^(1/2))
+        ];
+    p(i).y0 = [3;0;0];
+    p(i).h0 = -1;
+    p(i).xSpan = [0 20];
+    
+    i = i + 1;
+    
+    % B5 
+    p(i).name = 'non_stiff-B5';
+    p(i).f = @(x,y) [
+        y(2)*y(3);
+        -y(1)*y(3);
+        -0.51*y(1)*y(2)
+        ];
+    p(i).y0 = [0;1;1];
+    p(i).h0 = -1;
+    p(i).xSpan = [0 20];
+    
+    i = i + 1;
+    
+    %%%%%%%%%%%%%%%%%%%%
+    %Stiff problems: B 
+    %%%%%%%%%%%%%%%%%%%% 
+    
+    % Bl
+    p(i).name = 'stiff-B1';
+    p(i).f = @(x,y) [
+      -y(l) + y(2);
+      -100*y(1) - y(2);
+      -100*y(3)+y(4);
+      -10000*y(3)-100*y(4)
+      ];
+    p(i).y0= [1;0;1;0];
+    p(i).h0= 7*10^(-3);
+    p(i).xSpan = [0 20];
+
+    i = i + 1; 
+
+    % B2
+    alpha = 3;
+    p(i).name = 'stiff-B2';
+    p(i).f = @(x,y) [
+      -10*y(l) + alpha*y(2);
+      -alpha*y(1) - 10*y(2);
+      -4*y(3);
+      -4*y(4);
+      -0.5*y(5);
+      -0.1*y(6)
+      ];
+    p(i).y0= [1;1;1;1;1;1];
+    p(i).h0= 10^(-2);
+    p(i).xSpan = [0 20];
+
+    i = i + 1; 
+    % B3
+    alpha = 8;
+    p(i).name = 'stiff-B3';
+    p(i).f = @(x,y) [
+      -10*y(l) + alpha*y(2);
+      -alpha*y(1) - 10*y(2);
+      -4*y(3);
+      -4*y(4);
+      -0.5*y(5);
+      -0.1*y(6)
+      ];
+    p(i).y0= [1;1;1;1;1;1];
+    p(i).h0= 10^(-2);
+    p(i).xSpan = [0 20];
+
+    i = i + 1; 
+    % B4
+    alpha = 25;
+    p(i).name = 'stiff-B4';
+    p(i).f = @(x,y) [
+      -10*y(l) + alpha*y(2);
+      -alpha*y(1) - 10*y(2);
+      -4*y(3);
+      -4*y(4);
+      -0.5*y(5);
+      -0.1*y(6)
+      ];
+    p(i).y0= [1;1;1;1;1;1];
+    p(i).h0= 10^(-2);
+    p(i).xSpan = [0 20];
+
+    i = i + 1; 
+    % B5
+    alpha = 100;
+    p(i).name = 'stiff-B5';
+    p(i).f = @(x,y) [
+      -10*y(l) + alpha*y(2);
+      -alpha*y(1) - 10*y(2);
+      -4*y(3);
+      -4*y(4);
+      -0.5*y(5);
+      -0.1*y(6)
+      ];
+    p(i).y0= [1;1;1;1;1;1];
+    p(i).h0= 10^(-2);
+    p(i).xSpan = [0 20];
+
+    i = i + 1; 
+end