i am a beginner matlab user , and i have problem with the number of decimal places , i need to increase them , what should i do ? here is the code , can anyone just edit it to increase the number of decimal places

clear all
clc
f=@(x,y)x+y; %Write your f(x,y) function, where dy/dx=f(x,y), x(x0)=y0.
x0=input('\n Enter initial value of x i.e. x0: '); %example x0=0
y0=input('\n Enter initial value of y i.e. y0: '); %example y0=0.5
xn=input('\n Enter the final value of x: ');% where we need to find the value of y 
                                            %example x=2
h=input('\n Enter the step length h: '); %example h=0.2
 %Formula: y1=y0+h/2*[f(x0,y0)+f(x1,y1*)] where y1*=y0+h*f(x0,y0);
 fprintf('\n x        y '); 
while x0<=xn
    fprintf('\n%4.3f   %4.3f ',x0,y0);%values of x and y
    k=y0+h*f(x0,y0);
    x1=x0+h;
    y1=y0+h/2*(f(x0,y0)+f(x1,k));    
    x0=x1;
    y0=y1;  
end

Answer 1

[the cyclist]

You can use the format command, e.g.

format long

Note that MATLAB always stores the result as double precision by default -- you are only changing how the values will be displayed in the command window.

[Ahmad Magableh]

i have tried this command but it doesn't working , could you please edit my code with the new comand ,

[the cyclist]

Sorry, I missed that you were directly controlling the significant figures in your output commands. Instead of

fprintf('\n%4.3f   %4.3f ',x0,y0);%values of x and y

try something like

fprintf('\n%4.3f   %15.8f ',x0,y0);%values of x and y

The string in the fprintf command controls the precision. See the documentation for fprintf for details.