MATLAB: I am brand new to MATLab and do not know how to do a whileloop

while loop

x=0;
while (x<20)
    x=x+1
    f(x)= x^3 - (5*x)^2 + 2^(x) - 10000.*x;
fig=figure(1); clf; grid on; hold on;
     xlabel('x1'); ylabel('y1'); title('While Loop');
     p = plot(Value(:,1),Store(:,1));
     set(p,'Color','red','LineWidth',2);
end
what is wrong and why will it not plot? everything from fig=figure(1); on is given

Best Answer

Lots of errors - too many to list. Just study corrected code:
clc;    % Clear the command window.
close all;  % Close all figures (except those of imtool.)
clear;  % Erase all existing variables. Or clearvars if you want.
workspace;  % Make sure the workspace panel is showing.
format long g;
format compact;
fontSize = 25;
fig=figure(1);
x(1)=0;
fx(1) = 0;
index = 2;
while (x<20) & index < 1000 % Add index check as a failsafe.
  x(index)=x(index-1)+0.5
  fx(index)= x(index)^3 - (5*x(index))^2 + 2^(x(index)) - 10000.*x(index);
  clf;
  grid on;
  hold on;
  xlabel('x', 'FontSize', fontSize); 
  ylabel('fx', 'FontSize', fontSize); 
  title('While Loop', 'FontSize', fontSize);
  p = plot(x, fx, 'ro-', 'LineWidth',2, 'MarkerSize', 10);
  index = index + 1;
end
% Enlarge figure to full screen.
set(gcf, 'Units', 'Normalized', 'OuterPosition', [0 0 1 1]);
Of course I hope you know you could do this without a while loop in just a few lines, but I guess you were interested in the while loop mechanics rather than just how to plot a curve.
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