Plotting Smith Chart on MATLAB - Error

Hi everybody,

I am trying to plot a Smith chart on MATLAB. I am familiar with MATLAB but not when it comes to anything concerning with RF/Smith Chart plotting.

I am trying to plot a Smith chart with a 150 - 200j point plotted on it.

This is the error that I am getting:

Attempt to execute SCRIPT smithchart as a function: C:\Users\Ammar\Documents\MATLAB\smithchart.m Error in smith_ch_calc (line 3) sm1=smithchart;

I copy/pasted the code directly from someone who previously answered the question to a similar question that I had.

Here is the code:

    clc;clear all;format long; 
Z0=100;
sm1=smithchart;
ZL1=150-1j*200;f0=3e9; % Hz
gamma_L=(ZL1-Z0)/(ZL1+Z0); 
% show ZL1 on Smith chart adding text showing values
if imag(ZL1)<0
sign1='-';
else
    sign1='+';
end
hold all;plot(real(gamma_L),imag(gamma_L),'ro','LineWidth',1.5);
str1=['ZL =' num2str(real(ZL1)) sign1 'j' num2str(abs(imag(ZL1))) ' \rightarrow'];
text(real(gamma_L),imag(gamma_L)+.01,str1,'Color','blue','FontSize',20,'HorizontalAlignment','right','VerticalAlignment','middle');
  end

[KSSV]

The code is working fine.....in my pc..what does which smithchart gives?

Answer 1

[Walter Roberson]

The file C:\Users\Ammar\Documents\MATLAB\smithchart.m is not the Mathworks supplied smithchart.m file. You have your own smithchart.m file that is interfering with calling the Mathworks function.

For example this could happen if you had stored the code you posted in C:\Users\Ammar\Documents\MATLAB\smithchart.m

[Ammar Babikir]

Yes it worked! I had to delete the other files that I had stored with that name. Thank you!