How to plot 3D radiation pattern together from 2 separated .OGL files data in Matlab

Hello,

I am trying to plot 2 raw data into one 3D radiation pattern plot. The raw data .txt file contain 4 columns (column 1: magE in dB, column 2: x axis, column 3: y axis, column 4: z axis). Please see below code:

% Read the data from both files
data1 = readmatrix('F902.txt');
magE1 = data1(:, 1); 
x1 = data1(:, 2); 
y1 = data1(:, 3); 
z1 = data1(:, 4);
data2 = readmatrix('F915.txt');
magE2 = data2(:, 1);
x2 = data2(:, 2); 
y2 = data2(:, 3); 
z2 = data2(:, 4);

% Plot both radiation patterns 
figure;
patternCustom(magE1, x1, y1, z1);
title('Radiation Pattern from F902.txt');
figure;
patternCustom(magE2, x2, y2, z2);
title('Radiation Pattern from F915.txt');

Errors:

Error using patternCustom

The value of 'theta' is invalid. Expected input to be finite.

Error in patternCustom (line 102)

parse(parseobj, MagE, theta, phi, varargin{:});

Error in Plot3D_2 (line 16)

patternCustom(magE1, x1, y1, z1);

Please advise. I also attached 2 .txt files. In addition, is there other way to perform this plot?

Thanks alot.

Answer 1

[Walter Roberson]

patternCustom() does not accept x y z vectors. patternCustom accepts magE array or vector, and theta and phi vectors.

(In the case where magE is a vector, it must be N x 1 where N is the length of both theta and phi. Your code happens to match this restriction.)

[TN]

Hi Walter,

Thanks for your answer. Is there other function that I can use? Unfortunately, the raw data doesn't contain just magE, theta, and phi.

Thanks

[Walter Roberson]

You could consider using

[theta,rho] = cart2pol(x,y,z);