MATLAB篩選數據

文章目錄

• • MATLAB篩選數據
  • • 0.前言
    • 1.程序代碼

0.前言

任務要求如下；
把36萬行的數據集篩選出來，只剩下1800多行

1.程序代碼

%% clear; clc; filename_Old = 'WLTC.XLS';[~,Sheet,~]=xlsfinfo(filename_Old); % 求出文件有多少個sheet cell_array = [] ;process_show=waitbar(0,'檢查進度'); %顯示初始界面 for i= 1:length(Sheet)[~,~,total_number] = xlsread(filename_Old,Sheet{i}); % 因為一個sheet最多是65501行Percentage = i/length(Sheet);waitbar(Percentage,process_show,['已完成' (num2str(round(100*Percentage))) '%']); %進度條，進度增加情況 后面有判斷是否關閉flag_5_test = 1; % 用來標志 每10個就取一次值for VehicleSpeed_i = 1:length(total_number) % 因為一個sheet最多是65501行if isnan(total_number{VehicleSpeed_i,4}) | strcmp(char(total_number{VehicleSpeed_i,4}) , 'ESP_VehicleSpeed[km/h]' ) % 為空則跳過continue;else % 表示有數據 則記錄當前的行數flag_5_test =flag_5_test + 1;if mod(flag_5_test,10) == 0 %如果是能被10整除try %錯誤判斷%% 取出 Time 值Current_Time = round(total_number{VehicleSpeed_i,1});%% 取出 EMS_EngineSpeed 值EMS_EngineSpeed = round(total_number{VehicleSpeed_i-1,2});%% 取出 EMS_IndicatedRealEngTorq 值EMS_IndicatedRealEngTorq = round(total_number{VehicleSpeed_i+1,3});%% 取出 ESP_VehicleSpeed 值ESP_VehicleSpeed =round (total_number{VehicleSpeed_i,4});catchEMS_EngineSpeed = round(total_number{VehicleSpeed_i-1,2});%% 取出 EMS_IndicatedRealEngTorq 值EMS_IndicatedRealEngTorq = round(total_number{VehicleSpeed_i-2,4});end%% 把讀取的4個數據依次寫入新表中Data_need = [ Current_Time ,EMS_EngineSpeed ,EMS_IndicatedRealEngTorq ,ESP_VehicleSpeed ]; cell_array = [cell_array;Data_need]; % 按照列來存儲 % cell_array = [cell_array,Data_need]; % 按照行來存儲endendendend close(process_show);% 循環結束，關閉進度條 disp('正在保存數據...') save cell_array disp('保存成功')cell_array=load('cell_array.mat'); %a是一個的mat數據 X_time = cell_array.cell_array(:,1);y1_EMS_EngineSpeed = cell_array.cell_array(:,2);y2_IndicatedRealEngTorq = cell_array.cell_array(:,3); y3_VehicleSpeed = cell_array.cell_array(:,4);plot(X_time,y1_EMS_EngineSpeed,X_time,y2_IndicatedRealEngTorq,X_time,y3_VehicleSpeed)

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