如何通過matlab繪製excel中的時間戳數據

Question

我有一個包含2千個時間幅度數據集的excel文件。時間單元是A和振幅細胞是B的數據看起來像這樣：

2012年2月23日3:12 -69.4

2012年2月23日3:13 -70.3

2 /二千零十二分之二十三3:14 -73.3

2012年2月23日3:15 -75.4

2012年2月23日3:16 -78.1

2012年2月23日3:17 -80.1

如何繪製關於MATLAB中時間戳的幅度值？

Answer 1

代碼

%%// FILENAME 
filename = 'sid.xls'; 

%%// OPTION 1: If there is a lot of data, XTickLaabels and XTicks would clutter up. 
%%// To Avoid that, define the number of XTickLabels needed, 
%%// otherwise set it as NaN to use all x-data. 
XTickLabel_count = 3; 

%%// OPTION 2: If you would like to show the time only with dates 
time_only = false; 

%%// OPTION 3: If you would like to show the XTickLabels as 90 degrees rotated 
XTickRot = false; 

%%// Read in data 
[num,text1,raw] = xlsread(filename); 

%%// Account for 12AM times, which are not read in text1. Append that data. 
split1 = regexp(text1,'\s','Split'); 
zero_times = cellfun(@numel, split1)==1; 
text1(cellfun(@numel, split1)==1) = mat2cell([char(text1(zero_times)) repmat(' 00:00:00',nnz(zero_times),1)],ones(1,nnz(zero_times))); 

%%// Get the time only data without dates 
split1 = regexp(text1,'\s','Split'); 
split_text = vertcat(split1{:}); 
time_text = split_text(:,2); 

%%// Use the time only data for XTickLabels 
if time_only 
    text1 = time_text; 
end 

%%// Select few XTickLabels from the entire X-data or whole respectively 
%%// and store as text2 
if ~isnan(XTickLabel_count) 
    XTickIntv = round(numel(text1)/XTickLabel_count); 
    text2 = cell(size(text1)); 
    text2(1:XTickIntv:end)=text1(1:XTickIntv:end); 
else 
    text2 = text1; 
end 

%%// Plot 
figure,plot(num) 
set(gca, 'XTickLabel',text2, 'XTick',1:numel(text2)) 
if XTickRot 
    xticklabel_rotate([],90,text2); 
end 
set(gca, 'Ticklength', [0 0]) %%// Remove XTicks but keep XTicklabels 

return; 

注：此代碼使用XTICKLABEL_ROTATE from Mathworks File-exchange

方法1：使用XTickLabel_count = 3time_only = false和XTickRot = false

方法2：使用XTickLabel_count = 5time_only = true和XTickRot = false

方法3：使用XTickLabel_count = 10time_only = true和XTickRot = true