% init.m 
% Used to enter RHS and IVP conditions for 1st order ODEs of the form 
% x' = f(t,x). Needed by SLOPEF.M, % SOL1.M, HW3PLOT.M, PLOTSLN.M 

N=20; 
ftx='2*t*x';    % Enter ODE as string variable; e.g., '2*t*x' 
initax=[1,4,-2,0];   % Enter axis ranges as vector; e.g., [1,4,-2,0] 
ax=initax;   % Initialize working axis variable for axis(ax) 
             % Sets t and x axes to ax-values 
axis(ax)     % Sets axis to ax-values 
t=ax(1):(ax(2)-ax(1))/(N-1):ax(2);   % Sets t-values for axis 
t0=1.0932; x0=0.95208;  % Initial conditions obtained via experiment with sol1 
                     % e.g., t0=1.0932;; x0=0.95208; 
C=0.28817;   % Initialize constant of integration; e.g., C=0.28817; 
ftxsln='C*exp(t^2)';   % Enter hand-calculated solution as string variable 
                            % e.g., ftxsln='C*exp(t^2)';