Saving data points as a row and column

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Mini Me 2013-3-4

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链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/65864-saving-data-points-as-a-row-and-column

I have a program that takes points from a file and give the answer for each input point. Keep in mind that is being done in a loop. I want to take those results points and store them in a file. But when I use Fid=fopen(file, w+), it keeps updating the points so not all of them saved in there. On top of that I have another str2double points that I wan to save to the same file in a different column. That would give me two column of data points for me to plot. Can anybody hel? Because of the for loop it's keep writing and updating. When I use 'a' or 'a+' it appends but does not update. I want it to write all the points each in different row like this: First Sec

1. 3

2. 4

3. 5

But because of the loop it only keep the last points in the file

For k=1:1:21

Txt=importdata(file.txt, %s)

T=sscanf(Txt{k})

Y=str2double(T)

Fid=fopen(file,w)

fprintf(fid, %s, Y)

But it just won't keep all 21 values of y