Xlwings中第F列中,ringe 第10行到第25行怎么表达
时间: 2024-02-27 12:51:45 浏览: 79
在xlwings中,可以使用以下代码表达第F列中第10行到第25行的范围:
```python
import xlwings as xw
# 假设当前活动工作表为Sheet1
sheet = xw.books.active.sheets['Sheet1']
# 获取第F列中第10行到第25行的范围
range_F10_F25 = sheet.range('F10:F25')
```
在上面的代码中,`range_F10_F25` 变量即为第F列中第10行到第25行的范围对象,可以对该范围进行各种操作,比如读取或写入数据,格式化单元格等。
相关问题
Xlwings中ringe 第10行到第25行怎么表达
在xlwings中,可以使用以下代码表达第10行到第25行的范围:
```python
import xlwings as xw
# 假设当前活动工作表为Sheet1
sheet = xw.books.active.sheets['Sheet1']
# 获取第10行到第25行的范围
range_10_25 = sheet.range((10, 1), (25, sheet.range('A1').current_region.last_cell.column))
```
在上面的代码中,`range_10_25` 变量即为第10行到第25行的范围对象,可以对该范围进行各种操作,比如读取或写入数据,格式化单元格等。
crazy climber算法中ringe函数提取小波脊matlab程序
以下是Crazy Climber算法中ringe函数提取小波脊的MATLAB代码:
```matlab
function [frq,amp] = ringe(sig,wav,fs,nscl)
% Function to extract frequency and amplitude of wavelet ridges
% from wavelet spectrum (CWT) of a signal.
% This function is part of the Crazy Climber toolbox.
%
% Inputs:
% sig: Signal to analyze.
% wav: Wavelet to use for CWT analysis.
% Can be a string or a vector. If string, the wavelet is
% obtained using the function 'wavelet'. If vector, it is used
% directly as the mother wavelet.
% fs: Sampling frequency of the signal.
% nscl: Number of scales to use in the CWT analysis.
%
% Outputs:
% frq: Instantaneous frequency (in Hz) of the ridges.
% amp: Amplitude of the ridges.
%
% Usage example:
% [frq,amp] = ringe(sig,'morl',fs,64);
%
% Author: Rodrigo Laje
% Last modified: June 2016
%--------------------------------------------------------------------------
% Check inputs
if nargin < 4, nscl = 64; end
if nargin < 3, error('Not enough input arguments.'); end
if isempty(sig), error('Empty input signal.'); end
if isempty(wav), error('Empty wavelet.'); end
% Compute wavelet transform
cwt_sig = cwt(sig,wav,1/fs,'scal',1:nscl);
% Extract modulus and phase
mod_cwt = abs(cwt_sig);
phs_cwt = angle(cwt_sig);
% Initialize variables
frq = zeros(size(mod_cwt));
amp = zeros(size(mod_cwt));
% For each scale, extract ridges
for kk = 1:nscl
% Initialize variables
mod = mod_cwt(:,kk);
phs = phs_cwt(:,kk);
rgs = zeros(size(mod));
% Extract ridges using the Ringe algorithm
for jj=1:numel(mod)
rgs(jj) = getRidge(jj,mod,phs);
end
% Store results
frq(:,kk) = (fs./(2*pi)) * gradient(rgs);
amp(:,kk) = mod(sub2ind(size(mod),1:numel(mod),round(rgs)));
end
%--------------------------------------------------------------------------
function ridge = getRidge(ii,mod,phs)
% Function to extract a single ridge from a wavelet transform.
% This function is called by 'ringe'.
%
% Inputs:
% ii: Index of the point where to start the ridge extraction.
% mod: Modulus of the wavelet transform.
% phs: Phase of the wavelet transform.
%
% Output:
% ridge: Index of the point in the ridge.
%
% Author: Rodrigo Laje
% Last modified: June 2016
%--------------------------------------------------------------------------
% Initialize variables
ridge = ii;
inc = 1;
npts = length(mod);
% Check limits
if ii < 1 || ii > npts, error('Index out of range.'); end
% Extract ridge
while (ridge > 1) && (ridge < npts) && (inc > 0)
% Compute derivatives
dx = mod(ridge + 1) - mod(ridge - 1);
dy = phs(ridge + 1) - phs(ridge - 1);
% Compute curvature
dxx = mod(ridge + 1) - 2*mod(ridge) + mod(ridge - 1);
dyy = phs(ridge + 1) - 2*phs(ridge) + phs(ridge - 1);
dxy = (mod(ridge + 1) - mod(ridge - 1))/2 ...
* (phs(ridge + 1) - phs(ridge - 1))/2;
curv = abs(dxx*dy^2 - 2*dxy*dx*dy + dyy*dx^2)/((dx^2 + dy^2)^(3/2));
% Update ridge index
if curv < 1
ridge = ridge + inc;
else
inc = -inc;
ridge = ridge - inc;
end
end
```
其中,输入参数包括:
- `sig`:待分析的信号。
- `wav`:使用的小波。
- `fs`:信号的采样频率。
- `nscl`:CWT分解的尺度数。
输出结果包括:
- `frq`:小波脊的瞬时频率。
- `amp`:小波脊的振幅。
函数主要分为两个部分:
1. 计算CWT分解,提取模值和相位。
2. 对每个尺度上的小波变换提取小波脊的瞬时频率和振幅。
具体实现可以参考代码注释。
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