How to output multiple types of binary files in one file

I'm trying to output the DF to a binary file with one line. I'll show you a simple example.(In reality, it consists of hundreds of millions of rows of data.).

1. A1 should be uint32_t, B2 should be float32, and C3 should be uint32_t.
2. 'Little endian encoding' is required.

DF=

A1 B2 C3

1 7 13

2 8 14

3 9 15

4 10 16

5 11 17

6 12 18

The expected result after output is as follows.

Binary file =

1(uint32) 7(float32) 13(uint32) 2(uint32) 8(float32) 14(uint32) 3(uint32) 9(float32) 15(uint32) 4(uint32) 10(float32) 16(uint32) 5(uint32) 11(float32) 17(uint32) 6(uint32) 12(float32) 18(uint32)

Answer 1

[Chunru]

x = [
 1  7  13
 2  8  14
 3  9  15
 4 10  16
 5 11  17
 6 12  18];

fid = fopen("test.bin", "w", "ieee-le");
for i=1:size(x, 1)
    % 1(uint32) 7(float32) 13(uint32)
    fwrite(fid, x(i, 1), "uint32");
    fwrite(fid, x(i, 2), "float32");
    fwrite(fid, x(i, 3), "uint32");
end

fclose(fid);
dir 

.         ..        test.bin