convert matrix steps from 1 to 0.1

Hello,

i got a task with 2 Signals. I need to plot them on the x axis with from 0 seconds to 0.1 seconds. (200000 data with a frequency of 10Khz)

i have no clue how to do that. I limited the x axis t o1000 data (value of 0 to 0.1 seconds) but the numbers are still incorect.

thanks :)

Answer 1

[VBBV]

If you are plotting 0 to 0.1 sec using 1000 data points, the you have to divide it by frequency, 10 kHz

data./10000

Instead of

data*10000

Which you are doing presently

[VBBV]

Count of matrix elements are always in positive integers. Not in decimals or fractions. If you mean to divide a vector of values in 0.1 step increments then you can do

data./10

[Aaron Rosenberger]

Thank you !:)

Answer 2

[Star Strider]

Use the linspace function to define the time vector —

L = 0.1;                                        % signal Length (sec)
Fs = 1E+4;                                      % Sampling Frequency
t = linspace(0, L*(Fs-1), Fs)/Fs;               % Time Vector

format long
Ts = t(2)-t(1)                                  % Sampling Interval

Ts = 
     1.000000000000000e-05

f = 10;                                         % Signal Frequency
s = sin(2*pi*t*f);                              % Create Signal

figure
plot(t,s)
grid
xlabel('Time (s)')
ylabel('Amplitude')

.

[Aaron Rosenberger]

Thank you very much !:)

[Star Strider]

My pleasure!