Keep getting error in polyfit

JFz
2015 10 26
2 个回答
回答已采纳
更新时间：2015 10 26
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>> x = table2array(Test1_x);
>> y = table2array(Test1_y);
I keep getting this error in polyfit. Here is the code and output from Matlab during a simple test. x and y should be arrays of real numbers.
-----------------------------------------
>> poly_fit_coef = polyfit(x, y, 1);
Error using ones
CLASSNAME input must be a valid numeric class name.
Error in polyfit (line 59)
V(:,n+1) = ones(length(x),1,class(x));
--------------------------------------
What is wrong here?
Thanks in advance for any help!
Jennifer

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 采纳的回答

JFz
JFz 2015-10-26

0 个投票

I just got it! My x and y arrays have strings in them. I converted the strings to numbers and it worked!
x_d = str2double(x); y_d = str2double(y); poly_fit_coef = polyfit(x_d, y_d, 1);

更多回答（1 个）

Image Analyst
Image Analyst 2015-10-26
编辑：Image Analyst 2015-10-26

0 个投票

What does this say?
whos x
class(x)
whos y
class(y)
which -all polyfit

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JFz
JFz 2015-10-26
Thank you so much for your quick reply. I typed the commands and here are results: whos x Name Size Bytes Class Attributes
x 1000x1 126012 cell
which -all polyfit
C:\Program Files\MATLAB\R2014b\toolbox\matlab\polyfun\polyfit.m
Image Analyst
Image Analyst 2015-10-26
Like I thought, it wasn't a vector of numbers, but of strings.
Star Strider
Star Strider 2015-10-26
Well, all it said was ‘cell’. That could be anything.
Image Analyst
Image Analyst 2015-10-26
True. Since it came from table2array(), and we knew it wasn't a double, single, or an integer because it said "CLASSNAME input must be a valid numeric class name.", the most likely option that it would be is a cell array. Any cell array would generate this error - a cell array of strings, doubles, integers, etc.

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