MATLAB: Do I need symbolic math toolbox to graph a function such as f(x)=ln(x) or f(x, y)=y^2/x

beginnergraphMATLABSymbolic Math Toolbox

I just bought matlab and while processing data works well I cannot find how to graph functions from R to R for instance. Is it the case that I need to buy symbolic math toolbox in order to be able to do these graphings?

Best Answer

There is no need for the symbolic toolbox for such simple functions. Try this:

>> X = 0:0.1:3;
>> Y = log(X);
>> plot(X,Y)

Or your second example:

>> [X,Y] = meshgrid(0:0.1:2,1:5);
>> Z = Y.^2./X;
>> surf(X,Y,Z)

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MATLAB: How to plot a sym function with constant function such as x=2(vertical line) & y=3(horizontal line)

syms x y

eqn=y

eqn1=x

fplot(subs(eqn,y,3))

hold on

fplot(subs(eqn1,x,2))

MATLAB: E^x/x

function plot doesn't work with input type syms

Instead try the following

x=[-10:0.0001:10];
y=exp(x)./x;
plot(x,y);
axis([-10 10 -1e3 1e3])
grid on
title('e^x/x')

and the following doesn't crash

syms x x0;
  y= exp(x-x0)/(x-x0)
  x_tay4=taylor(y, 'order',4)
  y =
  exp(x - x0)/(x - x0)
  x_tay4 =
  (- exp(-x0)/(6*x0) - exp(-x0)/(2*x0^2) - exp(-x0)/x0^3 - exp(-x0)/x0^4)*x^3 + (- exp(-x0)/(2*x0) - exp(-x0)/x0^2 - exp(-x0)/x0^3)*x^2 + (- exp(-x0)/x0 - exp(-x0)/x0^2)*x - exp(-x0)/x0

if you find these lines useful would you please mark my answer as Accepted Answer?

To any other reader, if you find this answer of any help please click on the thumbs-up vote link,

thanks in advance for time and attention

John BG

<mailto:jgb2012@sky.com jgb2012@sky.com>

Best Answer

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MATLAB: How to plot a sym function with constant function such as x=2(vertical line) & y=3(horizontal line)

MATLAB: E^x/x

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