How to read and write to prn file?

HI,

I am trying to open and write to a prn file. The file has 7 columns and 8785 rows.

I need code so I an either make a new prn file with the same format or alter the file i already have.

I have used s2=tdfread('IWC.prn'); to open the file, and made a 1x1 struct. Then i made vectors for alle variables and manipulated it. Now I have all columns sorted but I have no Idea of how to make a prn file and make it look like I want it to do?? Look at my attechements please!!!

s2=tdfread('IWC.prn');

Tair=zeros(1,8784);

RelHum=zeros(1,8784);

WindX=zeros(1,8784);

WindY=zeros(1,8784);

IDirNorm=zeros(1,8784);

IDiffHor=zeros(1,8784);

Time=zeros(1,8784);

for i=2:8785

Tair(i-1)=s.x0x23_Time_TAir_RelHum_WindX_WindY_IDirNorm_IDiffHor(i,2);

RelHum(i-1)=s.x0x23_Time_TAir_RelHum_WindX_WindY_IDirNorm_IDiffHor(i,3);

WindX(i-1)=s.x0x23_Time_TAir_RelHum_WindX_WindY_IDirNorm_IDiffHor(i,4);

WindY(i-1)=s.x0x23_Time_TAir_RelHum_WindX_WindY_IDirNorm_IDiffHor(i,5);

IDirNorm(i-1)=s.x0x23_Time_TAir_RelHum_WindX_WindY_IDirNorm_IDiffHor(i,6);

IDiffHor(i-1)=s.x0x23_Time_TAir_RelHum_WindX_WindY_IDirNorm_IDiffHor(i,7);

Time(i-1)=s.x0x23_Time_TAir_RelHum_WindX_WindY_IDirNorm_IDiffHor(i-1,1);

end