MATLAB: Hi, does anybody knows how to plot graph using matlab from a txt file

plot graph

I wanted to plot a graph using matlab from a txt file? Do i need to create any function in order to plot this graph? Im trying to plot a time history graph (y axis in voltage, x axis in time)

Best Answer

Your file has 220250 elements, so it takes a while to read it and plot it.

Try this:

D = readtable('0.5hz.txt', 'HeaderLines',4);
Ts = str2double(D.dt_(1));
DataC = D.dt_(3:end);
DataM = str2double(DataC);
Time = linspace(0, numel(DataM), numel(DataM))*Ts;
figure(1)
plot(Time, DataM)
grid

Related Solutions

MATLAB: Plotting the same variable that changes 3 times on the one graph, for seven graphs at the same time.

With some guessing:

As far as I understand you want to draw into the same figures in each iteration. Then create the figures before the loop and remember the handles:

for k = 1:7
  FigH(k)  = figure;
  % Set NextPlot is the same as |hold on|:
  AxesH(k) = axes('NextPlot', 'add', 'Parent', FigH(k));
end
for k1 = 1:3
  for k2 = 1:7
    % Plot into k'th axes:
    plot(AxesH(k), 1:10, rand(1,10));
  end
end

MATLAB: Plot a sinusoidal signal from a file.dat

I would do it this way:

fidi = fopen('file.dat', 'rt');                             % Open File For Reading Text
Dc = textscan(fidi, '%f', 'CollectOutput',true);            % Change ‘textscan’ Arguments To Match Your File
D = cell2mat(D);                                            % Create Numeric Array
Fs = 8E+3;                                                  % Sampling Frequency (cycles/time unit)
Ts = 1/Ts;                                                  % Sampling Interval (time unit/cycle)
t = linspace(0, 1, length(D))*Ts;                           % Time Vector (Delete If You Saved Your Time Vector In Your File)
figure(1)
plot(t, D)                                                  % Plot Your Data
grid

Note — This is quite obviously UNTESTED CODE. A version of it should work. You will have to experiment with it with your data.

See the documentation for the various functions to understand how to use them, and how they work.

Best Answer

Related Solutions

MATLAB: Plotting the same variable that changes 3 times on the one graph, for seven graphs at the same time.

MATLAB: Plot a sinusoidal signal from a file.dat

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