Matrix Division Wrong Answer

As shown in the picture, I want the answer of S1\S2, while matlab gives me a wrong answer. The answer by my hand is [-1.004;0.6768;-0.0356].

Why I can't get the correct answer?

[Ameer Hamza]

How are the functions Big and Small defined? We cannot run the code, but probably you are making some errors in hand calculation.

[Weibo Zhao]

The whole project aims to use the best square approximation for lnx in[5,10].

[Ameer Hamza]

Which method did you use to calculate it by hand? MATLAB's calculations are correct. Please recheck your hand calculations

S1 = Big(5,10,2);
S2 = Small(5,10,2);
x = S1\S2;
y = S1*x
S2

Result

y =
   1.0e+02 *
   0.099786613488757
   0.762612807489856
   6.032462290899371


S2 =
   1.0e+02 *
   0.099786613488757
   0.762612807489856
   6.032462290899371

Same answers.

[Weibo Zhao]

That explains a lot! Thank you so much.

[Ameer Hamza]

Glad to be of help.