ezplot('sin(t)')
ezplot('sin(t)',[-4*pi 4*pi])
ezplot('sin(t)/t',[-4*pi 4*pi])
ezplot('x^2+y^2-1',[-1 1 -1 1])
hold on
ezplot('x^4+y^4-1',[-1 1 -1 1])
ezplot('x^6+y^6-1',[-1 1 -1 1])
ezplot('x^8+y^8-1',[-1 1 -1 1])
ezplot('x^10+y^10-1',[-1 1 -1 1])
title('"Five Hypercircles')
title('Five Hypercircles')
axis('equal','tight','off')
hold on
hold off
ezplot('t-sin(t)','1-cos(t)',[-.5*pi 2.5*pi])
axis('equal','tight','off')
ezplot3('cos(t)','sin(t)','t/(2*pi)',[0 6*pi])
ezmesh('sin(sqrt(x^2+y^2))/sqrt(x^2+y^2)',[-4*pi 4*pi -4*pi 4*pi])

ezsurf('sin(sqrt(x^2+y^2))/sqrt(x^2+y^2)',[-4*pi 4*pi -4*pi 4*pi])
axis('square')
shading interp
ezcontour('sin(sqrt(x^2+y^2))/sqrt(x^2+y^2)',[-4*pi 4*pi -4*pi 4*pi])

axis('square')
help ezcontour
 <strong>ezcontour</strong>   (NOT RECOMMENDED) Easy to use contour plotter
 
  ===================================================
  <strong>ezcontour</strong> is not recommended. Use FCONTOUR instead.
  ===================================================
 
    <strong>ezcontour</strong>(FUN) plots the contour lines of FUN(X,Y) using CONTOUR. FUN
    is plotted over the default domain -2*PI < X < 2*PI, -2*PI < Y < 2*PI.
 
    <strong>ezcontour</strong>(FUN,DOMAIN) plots FUN over the specified DOMAIN instead of
    the default domain. DOMAIN can be the vector [XMIN,XMAX,YMIN,YMAX]
    or the vector [A,B] (to plot over A < X < B and A < Y < B).
 
    <strong>ezcontour</strong>(...,N) plots FUN over the default domain using an N-by-N
    grid. The default value for N is 60.
 
    <strong>ezcontour</strong>(AX,...) plots into AX instead of GCA.
 
    H = <strong>ezcontour</strong>(...) returns handles to contour objects in H.
 
    Examples:
    The easiest way to express a function is via a string:
       ezcontour('x*exp(-x^2 - y^2)')
 
    One programming technique is to vectorize the string expression using
    the array operators .* (TIMES), ./ (RDIVIDE), .\ (LDIVIDE), .^ (POWER).
    This makes the algorithm more efficient since it can perform multiple
    function evaluations at once.
       ezcontour('x.*exp(-x.^2 - y.^2)')
 
    You may also use a function handle to an existing function. Function
    handles are more powerful and efficient than string expressions.
       ezcontour(@peaks)
 
    <strong>ezcontour</strong> plots the variables in string expressions alphabetically.
       subplot(1,2,1), ezcontour('x.*exp(-x.^2 - y.^2)')
    To avoid this ambiguity, specify the order with an anonymous function:
       subplot(1,2,2), ezcontour(@(y,x)x.*exp(-x.^2 - y.^2))
 
    If your function has additional parameters, for example k in myfun:
       %-----------------------%
       function z = myfun(x,y,k)
       z = x.^k - y.^k - 1;
       %-----------------------%
    then you may use an anonymous function to specify that parameter:
       ezcontour(@(x,y)myfun(x,y,2))
 
    See also <a href="matlab:help ezplot">ezplot</a>, <a href="matlab:help ezplot3">ezplot3</a>, <a href="matlab:help ezpolar">ezpolar</a>, <a href="matlab:help ezcontourf">ezcontourf</a>, <a href="matlab:help ezsurf">ezsurf</a>, <a href="matlab:help ezmesh">ezmesh</a>,
             <a href="matlab:help ezsurfc">ezsurfc</a>, <a href="matlab:help ezmeshc">ezmeshc</a>, <a href="matlab:help contour">contour</a>, <a href="matlab:help vectorize">vectorize</a>, <a href="matlab:help function_handle">function_handle</a>.

    <a href="matlab:doc ezcontour">Reference page for ezcontour</a>
    <a href="matlab:matlab.internal.language.introspective.overloads.displayOverloads('ezcontour')">Other functions named ezcontour</a>

ezcontour('sin(sqrt(x^2+y^2))/sqrt(x^2+y^2)',[-4*pi 4*pi -4*pi 4*pi],120)
axis('square')
xVals=[1 2 3 5 8 13 22 36  60 100]
xVals =
     1     2     3     5     8    13    22    36    60   100
yVals=3*xVals.^1.5
yVals =
   1.0e+03 *
  Columns 1 through 7
    0.0030    0.0085    0.0156    0.0335    0.0679    0.1406    0.3096
  Columns 8 through 10
    0.6480    1.3943    3.0000
rng('default')yVals=yVals*(1+0.1*randn(size(xVals)))
 rng('default')yVals=yVals*(1+0.1*randn(size(xVals)))
               
{Error: Invalid expression. Check for missing multiplication operator, missing
or unbalanced delimiters, or other syntax error. To construct matrices, use
brackets instead of parentheses.
} 
rng('default')
yVals=yVals*(1+0.1*randn(size(xVals)))
{Error using <a href="matlab:matlab.internal.language.introspective.errorDocCallback('mtimes')" style="font-weight:bold"> * </a>
Incorrect dimensions for matrix multiplication. Check that the number of
columns in the first matrix matches the number of rows in the second matrix. To
perform elementwise multiplication, use '.*'.} 
yVals=yVals.*(1+0.1*randn(size(xVals)))
yVals =
   1.0e+03 *
  Columns 1 through 7
    0.0026    0.0111    0.0167    0.0333    0.0727    0.1377    0.3057
  Columns 8 through 10
    0.7445    1.5907    3.4252
yVals=3*xVals.^1.5
yVals =
   1.0e+03 *
  Columns 1 through 7
    0.0030    0.0085    0.0156    0.0335    0.0679    0.1406    0.3096
  Columns 8 through 10
    0.6480    1.3943    3.0000
loglog(xVals,yVals,'o-')
rng('default')
yVals=yVals.*(1+0.1*randn(size(xVals)))
yVals =
   1.0e+03 *
  Columns 1 through 7
    0.0032    0.0100    0.0121    0.0364    0.0700    0.1222    0.2961
  Columns 8 through 10
    0.6702    1.8932    3.8308
loglog(xVals,yVals,'o-')
Coefs=polyfit(log(xVals),log(yVals),1)
Coefs =
    1.5442    1.0428
p=Coefs(1)
p =
    1.5442
C=exp(Coefs(2))
C =
    2.8372
(C-3)/3
ans =
   -0.0543
yPower=C*xVals.^p
yPower =
   1.0e+03 *
  Columns 1 through 7
    0.0028    0.0083    0.0155    0.0341    0.0704    0.1490    0.3357
  Columns 8 through 10
    0.7181    1.5805    3.4785
loglog(xVals,yVals,'o',xVals,yPower,'-')
yPowerExact=3*xVals.^1.5;
loglog(xVals,yVals,'o',xVals,yPower,'-',xVals,yPowerExact,'--')
xValues=linspace(0,1,n)
{Undefined function or variable 'n'.} 
n=5
n =
     5
m=4
m =
     4
xValues=linspace(0,1,n)
xValues =
         0    0.2500    0.5000    0.7500    1.0000
yValues=linspace(0,1,m)
yValues =
         0    0.3333    0.6667    1.0000
[xGrid yGrid]=meshgrid(xValues,yValues)
xGrid =
         0    0.2500    0.5000    0.7500    1.0000
         0    0.2500    0.5000    0.7500    1.0000
         0    0.2500    0.5000    0.7500    1.0000
         0    0.2500    0.5000    0.7500    1.0000
yGrid =
         0         0         0         0         0
    0.3333    0.3333    0.3333    0.3333    0.3333
    0.6667    0.6667    0.6667    0.6667    0.6667
    1.0000    1.0000    1.0000    1.0000    1.0000
plot(xGrid,yGrid,'or')
% must specify an array forcing
forcing=ones(m,n)
forcing =
     1     1     1     1     1
     1     1     1     1     1
     1     1     1     1     1
     1     1     1     1     1
forcing=ones(m,n)*2
forcing =
     2     2     2     2     2
     2     2     2     2     2
     2     2     2     2     2
     2     2     2     2     2
forcing(1,:)=1
forcing =
     1     1     1     1     1
     2     2     2     2     2
     2     2     2     2     2
     2     2     2     2     2
forcing(m,:)=1
forcing =
     1     1     1     1     1
     2     2     2     2     2
     2     2     2     2     2
     1     1     1     1     1
forcing(:,1)=1
forcing =
     1     1     1     1     1
     1     2     2     2     2
     1     2     2     2     2
     1     1     1     1     1
forcing(:,n)=1
forcing =
     1     1     1     1     1
     1     2     2     2     1
     1     2     2     2     1
     1     1     1     1     1
height=SimplePoisson(xValues,yValues,forcing)
{Undefined function or variable 'SimplePoisson'.} 
cd

\\print2.eng.fsu.edu\dommelen\My Documents\MATLAB\METLAB

height=SimplePoisson(xValues,yValues,forcing)
n =
     5
m =
     4
N =
    20
[Warning: Using CONDEST instead of COND for sparse matrix.] 
[> In <a href="matlab:matlab.internal.language.introspective.errorDocCallback('cond', 'C:\Program Files\MATLAB\R2018b\toolbox\matlab\matfun\cond.m', 25)" style="font-weight:bold">cond</a> (<a href="matlab: opentoline('C:\Program Files\MATLAB\R2018b\toolbox\matlab\matfun\cond.m',25,0)">line 25</a>)
  In <a href="matlab:matlab.internal.language.introspective.errorDocCallback('SimplePoisson', '\\print2.eng.fsu.edu\dommelen\My Documents\MATLAB\METLAB\SimplePoisson.m', 146)" style="font-weight:bold">SimplePoisson</a> (<a href="matlab: opentoline('\\print2.eng.fsu.edu\dommelen\My Documents\MATLAB\METLAB\SimplePoisson.m',146,0)">line 146</a>)] 
solRelerrDueToMatlab =
   3.5970e-14
height =
    1.0000    1.0000    1.0000    1.0000    1.0000
    1.0000    0.9025    0.8751    0.9025    1.0000
    1.0000    0.9025    0.8751    0.9025    1.0000
    1.0000    1.0000    1.0000    1.0000    1.0000
mesh(xGrid,yGrid,height)