matlab实验5

MATLAB实验五

一、实验目的：

Be familiar with Input/Output functions

二、实验内容：

1. Write a m-file. The m-file creates an

array containing 150

⨯random values, sorts the array into ascending

order, opens a user-specified file for

writing only, then writes the array to

disk in 32-bit floating-point format ,

and close the file. It then opens the

file and read the data back into 510

⨯array.

a=randn(1,50);

b=sort(a);

fid=fopen('mydata','w');

count1=fwrite(fid,b,'float32');

statues=fclose(fid);

fid=fopen('mydata','r');

[c,count2]=fread(fid,[5,10],'float32');

statues=fclose(fid);

2. Edit a file as data4_4.txt that contains

44

⨯square matrix, then import the

array use uiimport function, and

calculate the inverse of the square

matrix .

inv(data4_4)

ans

-0.1649 0.0970 0.0037 0.1413

0.0713 -0.0369 0.1140 -0.1264

-0.0128 0.1985 -0.1077 0.0286

0.1077 -0.1488 0.0327 0.0182

3. Write a program to read a set of integers from an input data file, and locate the largest and smallest values within the data file. Print out the largest and smallest values, together with the lines on which they were found in one figure.

a=randn(1,200);

b=int8(a.*60);

fid=fopen('data','w');

count1=fwrite(fid,b,'float32');

statues=fclose(fid);

fid=fopen('data','r');

[c,count2]=fread(fid,[1,200],'float32');

statues=fclose(fid);

[x,maxn]=max(c);

[y,minn]=min(c);

num=1:1:200;

plot(num,c,maxn,x,'r*',minn,y,'g*')

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