Give a command that returns the total number of processes running on your system.
时间: 2024-01-04 08:03:16 浏览: 37
To return the total number of processes running on a Linux/Unix system, you can use the following command in the terminal:
```
ps aux | wc -l
```
This will display the number of processes currently running on the system.
Alternatively, you can use the following command to display the number of running processes in real-time (updated every few seconds):
```
watch "ps aux | wc -l"
```
This will continuously display the number of processes running on the system until you exit the watch command.
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why people say that marriage is the tomb of love, give a speech about 200 words.
Marriage is often seen as the ultimate symbol of commitment and devotion between two individuals, yet why do some people suggest that it is the "tomb of love"? For many, the idea of "marriage" conjures up images of a lifeless, mundane and restrictive existence. Once the initial excitement of falling in love fades, some couples might feel trapped in a cycle of routine and predictability, which can leave their love feeling stagnant and unfulfilling. This is where the cliche of the "tomb of love" comes from - the fear that marriage will somehow stifle and suffocate the passion that once existed between two people.
However, it is important to remember that no relationship, including marriage, is free from challenges or hardships. The key to overcoming these obstacles lies in communication, commitment, and a willingness to work through problems together. Furthermore, marriage can be a fulfilling and rewarding experience, offering opportunities for growth, companionship, and intimacy.
Ultimately, whether marriage becomes a "tomb of love" or a source of fulfillment lies in the hands of the individuals involved. It is up to each partner to choose love, to nurture the relationship, and to maintain the spark that ignited their love in the first place. Rather than fearing the "tomb of love", we should embrace the possibilities and growth that marriage can bring to our lives, learning to cherish and appreciate the person we have committed to spending our lives with.
Can you give a MATLAB example of a multi carrier system based on CMFB
Sure, here's an example of a multi-carrier system based on Constant Modulus Feedback (CMFB) in MATLAB:
```
%% Define parameters
N = 1024; % Number of subcarriers
M = 16; % Modulation order
P = 4; % Number of pilot subcarriers
L = 8; % Length of equalizer
sigma2 = 0.1; % Noise variance
%% Generate symbols
x = randi([0 M-1], N-P, 1); % Random data symbols
p = randi([0 M-1], P, 1); % Pilot symbols
%% Modulate symbols
x_mod = qammod(x, M); % QAM modulation
p_mod = qammod(p, M); % QAM modulation
%% Add pilot symbols
x_with_pilot = zeros(N, 1);
x_with_pilot(1:P) = p_mod;
x_with_pilot(P+1:end) = x_mod;
%% Generate channel coefficients
h = randn(L, 1) + randn(L, 1)*1i; % Complex channel coefficients
%% Generate received signal
y = conv(h, x_with_pilot); % Channel convolution
y = y(P+1:end-L+1); % Remove pilot and excess convolution samples
y = awgn(y, sigma2); % Add noise
%% CMFB equalization
H = toeplitz(h, zeros(1, N-L));
e = zeros(N, 1);
mu = 0.1; % Step size
w = zeros(L, 1); % Initial weights
for i = 1:N
z = H(:,i)' * w; % Estimate of symbol
e(i) = y(i) - z; % Error
w = w + mu * e(i) * H(:,i); % Update weights
end
%% Calculate BER
x_hat = qamdemod(H' * w, M); % Demodulate received symbols
ber = sum(x ~= x_hat) / length(x);
disp(['BER: ' num2str(ber)]);
```
This code generates random QAM symbols, adds pilot symbols, convolves with a random channel impulse response, adds noise, and then uses CMFB equalization to estimate the transmitted symbols. Finally, it calculates the bit error rate (BER) to evaluate the performance of the system.