MATLAB对csv文件的某一列数据进行数据处理

clc
clear all
close all
 M = csvread('shui_A-Aref.csv', 1, 2);
N = csvread('kongA-Aref.csv', 1, 2);
 baseline_1 = mean(M(1:16));
baseline_2 = mean(N(1:16));
 A = length(M);
B = length(N);
j = 0;
k = 0;
a = [];
c = [];
d = [];
threshold = -1050;
 将A数组的数据一个个输入
 for i = 17:A
     if M(i) < baseline_1
         baseline_1 = M(i);
         j = 0;
    elseif M(i)>baseline_1 && M(i) < threshold
            baseline_1 = baseline_1*0.75+0.25*M(i);
            j = 0;
    elseif  M(i)>=threshold
              j = j+1 ;
              if j >= 8
                 a = [a;i,M(i)]; 
                 fprintf('chufa\n')
              end
     end   
 end
% 将B数组的数据一个个输入
for  h = 17:B
    if N(h) < baseline_2
        baseline_2 = N(h);
        k=0;   
   elseif N(h)>baseline_2 && N(h)<threshold
           baseline_2 = baseline_2*0.75+0.25*N(h);              
   elseif  N(h)>=threshold
             k = k+1 ;
            if k == 8
               c = [c;(h-7),N(h-7)]; 
            elseif k>8 && N(h+1)<threshold
               d = [d;h,N(h)];
            end         
    end   
end
plot(N)
hold on
scatter(c(:,1),c(:,2),'*')
hold on
scatter(d(:,1),d(:,2),'x')
hold off