plotting graph using symbolic equation

syms h11 h12 h21 h22 ZL

f=1000 to 1MHz

Zin=h11-(h12*h21)/(h22+(1/ZL)) %equation to plot

simplify(Zin)

pretty(Zin)

Avh=-h21/(Zin*(h22+(1/ZL)))

simplify(Avh)

fplot(f,Avh, 'b-', 'LineWidth', 2)

xlabel('Frequency', 'FontSize', 20);

ylabel('Gain Av', 'FontSize', 20);

title('Gain vs Frequency', 'FontSize', 20);

i need help to plot Av vs frequency symbolically

range of frequency 1KHz to 1MHz,

this is the equation to solve

Zin=h11-(h12*h21)/(h22+(1/ZL)) %equation to plot

simplify(Zin)

pretty(Zin)

Avh=-h21/(Zin*(h22+(1/ZL)))

simplify(Avh)

Answer 1

[Torsten]

From what you wrote, there is no relation between f and Avh.

Can you write down Avh as a function of f so that - given numerical values for f - you directly get numerical values for Avh ?

Answer 2

[Star Strider]

None of the variables are explicit functions of frequency. They must be functions of frequency and have all the other values defined numerically for this to work.

syms h11 h12 h21 h22 ZL
f=[1000  1E+6];
Zin=h11-(h12*h21)/(h22+(1/ZL))  %equation to plot

Zin = 

simplify(Zin)

ans = 

pretty(Zin)

       h12 h21
h11 - --------
             1
      h22 + --
            ZL

Avh=-h21/(Zin*(h22+(1/ZL)))

Avh = 

simplify(Avh,500)

ans = 

figure
fplot(Avh,f, 'b-', 'LineWidth', 2)                      % The Frequency Range Vector 'f' Must Be The Second Argument In 'fplot'

Error using fplot>singleFplot
Input must be a function or functions of a single variable.

Error in fplot>@(f)singleFplot(cax,{f},limits,extraOpts,args) (line 200)
hObj = cellfun(@(f) singleFplot(cax,{f},limits,extraOpts,args),fn{1},'UniformOutput',false);

Error in fplot>vectorizeFplot (line 200)
hObj = cellfun(@(f) singleFplot(cax,{f},limits,extraOpts,args),fn{1},'UniformOutput',false);

Error in fplot (line 166)
hObj = vectorizeFplot(cax,fn,limits,extraOpts,args);

xlabel('Frequency', 'FontSize', 20);
ylabel('Gain Av', 'FontSize', 20);
title('Gain vs Frequency', 'FontSize', 20);

% i need help to plot Av vs frequency symbolically
% range of frequency 1KHz to 1MHz,
% this is the equation to solve
Zin=h11-(h12*h21)/(h22+(1/ZL))  %equation to plot
simplify(Zin)
pretty(Zin)
Avh=-h21/(Zin*(h22+(1/ZL)))
simplify(Avh)

.