向量化换档阵列

Question

我有一个for循环，可将信号移位一定量并将其附加到数组中。我该如何对circshift节进行矢量化处理，这样就不需要使用for循环了？

fs_rate=10
len_of_sig=1; %length of signal in seconds
t=linspace(0,len_of_sig,fs_rate*len_of_sig);

y=.5*sin(2*pi*1*t);
for aa=1:length(y)
  y_new(aa,:)=circshift(y,[1,aa+3]); %shifts signal and appends to array

end
plot(t,y_new)

PS：我正在使用Octave 4.2.2 Ubuntu 18.04 64bit

Answer 1

在将/** * Get the last offset for the given partitions. The last offset of a partition is the offset of the upcoming * message, i.e. the offset of the last available message + 1. If messages have never been written * to the the partition, the offset returned will be 0. * * <p> * This method does not change the current consumer position of the partitions. * <p> * When {@code isolation.level=read_committed} the last offset will be the Last Stable Offset (LSO). * This is the offset of the first message with an open transaction. The LSO moves forward as transactions * are completed. * * @see #seekToEnd(Collection) * * @param partitions the partitions to get the end offsets. * @return The end offsets for the given partitions. * @throws org.apache.kafka.common.errors.AuthenticationException if authentication fails. See the exception for more details * @throws org.apache.kafka.common.errors.AuthorizationException if not authorized to the topic(s). See the exception for more details * @throws org.apache.kafka.common.errors.TimeoutException if the offsets could not be fetched before * expiration of the configured {@code request.timeout.ms} */ @Override public Map<TopicPartition, Long> endOffsets(Collection<TopicPartition> partitions) 用于基本移位之后，您可以使用gallery创建一个圆形矩阵：

circshift

或者，如果您想知道其实现方式，请查看其源代码base_shift = 4; fs_rate = 10; len_of_sig = 1; # length of signal in seconds t = linspace (0, len_of_sig, fs_rate*len_of_sig); y = .5 * sin (2*pi*1*t); y = gallery ("circul", circshift (y, [1 base_shift]));