Basically I'm just trying to curve fit some data but the line of best fit is not correct. Here is the code I have so far
clear all; close allc = xlsread('Elastic Modulus.xlsx','Sheet1');temp = c(:,1);carbonSteel = c(:,2);plot(temp,carbonSteel,'*')hold onp = polyfit(temp,carbonSteel,3);y = polyval(p,carbonSteel);plot(temp,y)
The temp and carbonsteel columns contain the values:
temp = -200 -129 -73 21 93 149 204 260 316 371 427 482 538 593 carbonSteel = 31.4000 30.8000 30.2000 29.5000 28.8000 28.3000 27.7000 27.3000 26.7000 25.5000 24.2000 22.4000 20.4000 18.0000
When I plot it just shows a straight line. How do I fix this? Thank you!
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