plotting a function over time using a for loop

 I've been trying to set a matrix equal to the results of two functions over a range, but am not having any luck. Can someone proofread for me?   

x1 = [1:0.01:3];
  %set x to a variable from 1 to 3
  b1=zeros(1,201);
  y1=zeros(1,201);

    for x2=1:201;
        x3=x1(x2);
    b1(x2)=sin(x3)+1;
    y1(x2)=x3+exp(-x3/2);

    end

Answer 1

[Image Analyst]

I improved it some for you and fancied up the graph but I still don't know what you want. Exactly what does "set a matrix equal to the results of two functions over a range" mean ? You have two function and two results from those functions: y1 and b1. Exactly how is the "matrix" supposed to use those two results? Set equal to the sum? The product? The ratio? What???

clear all;
clc;
close all; % Close any prior figure from this program that we have open.
fontSize = 25;
numberOfPoints = 50;
% Set x1 to 50 values from 1 to 3.
x1 = linspace(1, 3, numberOfPoints);
% Preallocate space for other arrays.
b1 = zeros(1, numberOfPoints);
y1 = zeros(1, numberOfPoints);
% Loop, assigning values to y1.
for k = 1 : numberOfPoints;
  % Get this x value from x1 array.
  this_x = x1(k);
  % Calculate b1.
  b1(k) = sin(this_x) + 1; 
  % Calculate y1
  y1(k) = this_x + exp(-this_x/2);  
end
% Plot y1 as a function of x1.
plot(x1, y1, 'b+-');
hold on;
% Plot b1 as a function of x1.
plot(x1, b1, 'ro-');
grid on;
% Set x and y limits on the axes.
xlim([0, 3]);
ylim([0, 4]);
% Set titles
title('Some functions', 'FontSize', fontSize);
xlabel('x1', 'FontSize', fontSize);
ylabel('y1 and b1', 'FontSize', fontSize);
% Enlarge figure to full screen.
set(gcf, 'Units', 'Normalized', 'OuterPosition', [0 0 1 1]);

[Cameron]

Thanks! You gave me what I needed, i just needed to remember how to set up the for loop properly.

[Image Analyst]

You're welcome. Thanks for accepting. You might want to add this to the program:

legend('y1', 'b1');