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这是别人给我的程序，我想问一下怎么把我的两个excel数据导入，以及公式怎么写？
clc;
clear all;
close all;data=dlmread('all_data_in_situ_lxz.txt');data(6,:)=[];
data(12,:)=[];
data(13,:)=[];
data(13,:)=[];
data(24,:)=[];
index=find(data(:,11)>10);
data(index(1:end),:)=[];
samples=size(data,1);
C_pred_all_val=ones(samples,1);
rsqr_C_all_val=ones(samples,1);
RMSE_C_all_val=ones(samples,1);
APD_C_all_val=ones(samples,1);
beta_C_all=ones(samples,4);
for j=1:samples
C_val_all=data(j,:);
tem_tur=data;
tem_tur(j,:)=[];
C_cal_all=tem_tur;
C_x1=(C_cal_all(:,1))./(C_cal_all(:,7));
C_x2=(C_cal_all(:,2))./(C_cal_all(:,7));
C_x3=(C_cal_all(:,4))./(C_cal_all(:,7));
C_x=[C_x1 C_x2 C_x3];
myfunc_C = @(beta_C, C_x)(beta_C(1).*C_x1+beta_C(2).*C_x2+beta_C(3).*C_x3+beta_C(4));
options_C = statset('MaxIter', 1000);
beta0_C=[0 0 0 0];
[beta_C,Res_C_val,J_C,COVB_C,mse_C] = nlinfit(C_x,log10(C_cal_all(:,11)),myfunc_C,beta0_C,options_C);
beta_C;
beta_C_all(j,:)=beta_C;
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
C_pred=10.^(beta_C(1).*((C_val_all(:,1))./(C_val_all(:,7)))+beta_C(2).*((C_val_all(:,2))./(C_val_all(:,7)))+beta_C(3).*((C_val_all(:,4))./(C_val_all(:,7)))+beta_C(4));
Res_C_val=(C_pred-C_val_all(:,11));
rsqr_Cval=(corr(C_pred,C_val_all(:,11)))^2;
RMSE_C_val=sqrt(mean(Res_C_val.^2));
APD_C_val=sum(abs(Res_C_val)./CDOM_val_all(:,11))./size(C_val_all(:,11))*100;
C_pred_all_val(j)=C_pred;
rsqr_C_all_val(j)=rsqr_C_val;
RMSE_C_all_val(j)=RMSE_C_val;
APD_C_all_val(j)=APD_C_val(1);
scatter(C_val_all(:,11),CDOM_pred,100,'k','LineWidth',2,'MarkerEdgeColor','k','MarkerFaceColor','k');
axis([0 10 0 10]);
hold on
end
beat_cdom_mean=mean(beta_CDOM_all);
statics=[data(:,11) CDOM_pred_all_val APD_CDOM_all_val RMSE_CDOM_all_val];
)
