Function file doesn`t work

Hello everyone,

I have three files: a txt. notebook with data, an .m-function file that should read it und the final .m-file that should put out a Bode-Diagramm.

M=readLTspice('Lab5_R_100_MOhm.txt', 'Nyquist')

M = 401x1 cell array
    {'1.00000000000000e+01, -2.08189672696186e+01  4.09652407317561e+00  , -2.08282439196099e+01  2.30078164043620e+00  , -2.08289762322040e+01 5.01660348954929e-01  '  }
    {'1.02329299228075e+01, -2.08181283142261e+01  4.15357406497834e+00  , -2.08280079148297e+01  2.31618666349063e+00  , -2.08289420000263e+01  4.75171371133909e-01  ' }
    {'1.04712854805090e+01, -2.08172537426266e+01  4.21280474346613e+00  , -2.08277645633479e+01  2.33281685928302e+00  , -2.08289099234277e+01  4.48934122648612e-01  ' }
    {'1.07151930523761e+01, -2.08163417223260e+01  4.27424600877758e+00  , -2.08275133504514e+01  2.35068086982330e+00  , -2.08288799344165e+01  4.22934708601109e-01  ' }
    {'1.09647819614319e+01, -2.08153903435541e+01  4.33792882437890e+00  , -2.08272537448840e+01  2.36978797667213e+00  , -2.08288519694245e+01  3.97159359259556e-01  ' }
    {'1.12201845430196e+01, -2.08143976154200e+01  4.40388522596117e+00  , -2.08269851977339e+01  2.39014810496063e+00  , -2.08288259691729e+01  3.71594422831076e-01  ' }
    {'1.14815362149688e+01, -2.08133614619167e+01  4.47214833037342e+00  , -2.08267071412837e+01  2.41177182767898e+00  , -2.08288018785463e+01  3.46226358293909e-01  ' }
    {'1.17489755493953e+01, -2.08122797177649e+01  4.54275234456042e+00  , -2.08264189878222e+01  2.43467037022449e+00  , -2.08287796464768e+01  3.21041728283095e-01  ' }
    {'1.20226443461741e+01, -2.08111501240923e+01  4.61573257447091e+00  , -2.08261201284158e+01  2.45885561522137e+00  , -2.08287592258354e+01  2.96027192028268e-01  ' }
    {'1.23026877081238e+01, -2.08099703239392e+01  4.69112543390032e+00  , -2.08258099316357e+01  2.48434010759362e+00  , -2.08287405733323e+01  2.71169498340568e-01  ' }
    {'1.25892541179417e+01, -2.08087378575848e+01  4.76896845323113e+00  , -2.08254877422401e+01  2.51113705989832e+00  , -2.08287236494257e+01  2.46455478642213e-01  ' }
    {'1.28824955169313e+01, -2.08074501576858e+01  4.84930028802747e+00  , -2.08251528798069e+01  2.53926035791243e+00  , -2.08287084182377e+01  2.21872040039108e-01  ' }
    {'1.31825673855641e+01, -2.08061045442210e+01  4.93216072743863e+00  , -2.08248046373158e+01  2.56872456647044e+00  , -2.08286948474786e+01  1.97406158429501e-01  ' }
    {'1.34896288259165e+01, -2.08046982192330e+01  5.01759070236573e+00  , -2.08244422796765e+01  2.59954493554465e+00  , -2.08286829083784e+01  1.73044871648373e-01  ' }
    {'1.38038426460288e+01, -2.08032282613610e+01  5.10563229333777e+00  , -2.08240650421994e+01  2.63173740657307e+00  , -2.08286725756261e+01  1.48775272642225e-01  ' }
    {'1.41253754462275e+01, -2.08016916201548e+01  5.19632873804297e+00  , -2.08236721290064e+01  2.66531861901755e+00  , -2.08286638273158e+01  1.24584502671697e-01  ' }
    {'1.44543977074593e+01, -2.08000851101640e+01  5.28972443845615e+00  , -2.08232627113798e+01  2.70030591715966e+00  , -2.08286566449008e+01  1.00459744537583e-01  ' }
    {'1.47910838816821e+01, -2.07984054047934e+01  5.38586496749805e+00  , -2.08228359260431e+01  2.73671735711753e+00  , -2.08286510131539e+01  7.63882158289763e-02  ' }
    {'1.51356124843621e+01, -2.07966490299161e+01  5.48479707515860e+00  , -2.08223908733742e+01  2.77457171408543e+00  , -2.08286469201356e+01  5.23571621875418e-02  ' }
    {'1.54881661891248e+01, -2.07948123572372e+01  5.58656869401342e+00  , -2.08219266155444e+01  2.81388848978482e+00  , -2.08286443571681e+01  2.83538505867324e-02  ' }
    {'1.58489319246111e+01, -2.07928915973989e+01  5.69122894405187e+00  , -2.08214421745813e+01  2.85468792011740e+00  , -2.08286433188180e+01  4.36556262132412e-03  ' }
    {'1.62181009735893e+01, -2.07908827928189e+01  5.79882813673923e+00  , -2.08209365303513e+01  2.89699098302055e+00  , -2.08286438028838e+01  -1.96204121956790e-02  '}
    {'1.65958690743756e+01, -2.07887818102543e+01  5.90941777821851e+00  , -2.08204086184589e+01  2.94081940650403e+00  , -2.08286458103917e+01  -4.36167831323406e-02  '}
    {'1.69824365246174e+01, -2.07865843330826e+01  6.02305057156269e+00  , -2.08198573280569e+01  2.98619567686873e+00  , -2.08286493455978e+01  -6.76362649355398e-02  '}
    {'1.73780082874937e+01, -2.07842858532911e+01  6.13978041797301e+00  , -2.08192814995658e+01  3.03314304708767e+00  , -2.08286544159970e+01  -9.16915845331655e-02  '}
    {'1.77827941003892e+01, -2.07818816631675e+01  6.25966241681895e+00  , -2.08186799222959e+01  3.08168554534757e+00  , -2.08286610323390e+01  -1.15795487740835e-01  '}
    {'1.81970085860998e+01, -2.07793668466832e+01  6.38275286440308e+00  , -2.08180513319698e+01  3.13184798372762e+00  , -2.08286692086508e+01  -1.39960745978628e-01  '}
    {'1.86208713666287e+01, -2.07767362705622e+01  6.50910925133189e+00  , -2.08173944081392e+01  3.18365596700682e+00  , -2.08286789622665e+01  -1.64200163001421e-01  '}
    {'1.90546071796325e+01, -2.07739845750274e+01  6.63879025836344e+00  , -2.08167077714922e+01  3.23713590158876e+00  , -2.08286903138642e+01  -1.88526581643838e-01  '}
    {'1.94984459975804e+01, -2.07711061642184e+01  6.77185575059345e+00  , -2.08159899810462e+01  3.29231500451642e+00  , -2.08287032875095e+01  -2.12952890586412e-01  '}

f=M(:,1);
A=M(:,2);

Index in position 2 exceeds array bounds. Index must not exceed 1.

Ph=M(:,3);

figure(1)
subplot(2,1,1);
plot(f, A , "b");
set(gca, 'XScale', 'log');
subplot(2,1,2);
plot(f, Ph, "g");
set(gca, 'XScale', 'log');

function [M]=readLTspice(fileName, selector)
% MATLAB function to read files exported from LTspice
%   M = readLTspice(fileName, selector)
%   fileName - name of file to be read as string (including .txt)
%   selector - type of simulation (Time, Bode or Nyquist)
% data in time or cartesian form
if selector=="Time" | selector=="time" | selector=="Nyquist" | selector=="nyquist"
    tempFileName = strcat(erase(fileName, '.txt'), '_Temp.txt');
    textOriginal = readTFile(fileName);
    textKorrigiert = regexprep(textOriginal(3:end), '\t', ',');
    writeTFile(tempFileName,textKorrigiert);
    M = importdata(tempFileName);
    delete(tempFileName);
    
    % data in polar form
elseif selector=="Bode" | selector=="bode"
    tempFileName = strcat(erase(fileName, '.txt'), '_Temp.txt');
    textOriginal = readTFile(fileName);
    textKorrigiert = regexprep(textOriginal(3:end), '\t', ',');
    textKorrigiert = regexprep(textKorrigiert, '°', '');
    textKorrigiert = regexprep(textKorrigiert, 'dB', '');
    textKorrigiert = regexprep(textKorrigiert, '(', '');
    textKorrigiert = regexprep(textKorrigiert, ')', '');
    writeTFile(tempFileName,textKorrigiert);
    M = importdata(tempFileName);
    delete(tempFileName);
    % wrong call
else
    error("Argument für Format der exportierten Daten unzulässig!" + char(10) + "Bitte überprüfen Sie, wie die Daten aus LTspice exportiert wurden" + char(10) + "und nutzen eines der folgenden Argumente: [Time], [Bode], [Nyquist]." + char(10) + char(10) + "Der LTspice-Leitfaden im ISIS-Kurs gibt genauere Hinweise zur Verwendung von [readLTspice]." + char(10));
end
end
function T=readTFile(fileName)
textOriginal = '';
fid=fopen(fileName);
tline = fgetl(fid);
while ischar(tline)
    textOriginal = textOriginal+"\n"+tline;
    tline = fgetl(fid);
end
fclose(fid);
T = splitlines(compose(textOriginal));
end
function writeTFile(fileName,fileText)
fileID = fopen(fileName,'w');
fprintf(fileID,'%s\n',fileText);
fclose(fileID);
end

However, something always goes wrong:

What could I do? Thank you.

Answer 1

[Voss]

T = readtable('Lab5_R_100_MOhm.txt','VariableNamingRule','preserve')

T = 401x7 table
    Freq.     Vn007/Vn001    Vn007/Vn001_1    Vn008/Vn003    Vn008/Vn003_1    Vn012/Vn005    Vn012/Vn005_1
    ______    ___________    _____________    ___________    _____________    ___________    _____________

        10      -20.819         4.0965          -20.828         2.3008          -20.829         0.50166   
    10.233      -20.818         4.1536          -20.828         2.3162          -20.829         0.47517   
    10.471      -20.817         4.2128          -20.828         2.3328          -20.829         0.44893   
    10.715      -20.816         4.2742          -20.828         2.3507          -20.829         0.42293   
    10.965      -20.815         4.3379          -20.827         2.3698          -20.829         0.39716   
     11.22      -20.814         4.4039          -20.827         2.3901          -20.829         0.37159   
    11.482      -20.813         4.4721          -20.827         2.4118          -20.829         0.34623   
    11.749      -20.812         4.5428          -20.826         2.4347          -20.829         0.32104   
    12.023      -20.811         4.6157          -20.826         2.4589          -20.829         0.29603   
    12.303       -20.81         4.6911          -20.826         2.4843          -20.829         0.27117   
    12.589      -20.809          4.769          -20.825         2.5111          -20.829         0.24646   
    12.882      -20.807         4.8493          -20.825         2.5393          -20.829         0.22187   
    13.183      -20.806         4.9322          -20.825         2.5687          -20.829         0.19741   
     13.49      -20.805         5.0176          -20.824         2.5995          -20.829         0.17304   
    13.804      -20.803         5.1056          -20.824         2.6317          -20.829         0.14878   
    14.125      -20.802         5.1963          -20.824         2.6653          -20.829         0.12458   

f = T.(1);
A = T.(2);
Ph = T.(3);

figure
tiledlayout(2,1)
nexttile()
semilogx(f,10*log10(-A))
ylabel('Magnitude')
nexttile()
semilogx(f,Ph)
xlabel('Frequency')
ylabel('Phase')