MATLAB: What is wrong with this

errorlinspacepolyfit

Hey I wrote:

X=linspace (0,1,8) 
Y=A (13:20,2)

(I had "A" form my last program)

P=polyfit (X,Y,7)

And it says error using polyfit X and Y vectors must be the same size! But they are same sized!!!I don't know what's wrong with it!

Best Answer

They have the same number of elements, but they are not the same shape. You need to transpose one of them.

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MATLAB: Nonlinear 2D elliptic problem u_xx+u_yy= f(x,y)

f=reshape(f',(Nx+1)*(Ny+1),1);

Best wishes

Torsten.

MATLAB: It seems thta the function “polyfit” doesn´t work anymore in the Matlab, how can I solve this problem

The error message indicates that the file, C:\Users\pca02\Desktop\Documents\MATLAB\polyfit.m, shadows the true polyfit.m. You seems to have created a file with the name polyfit.m

Run

    which polyfit -all

it shall return something like

    C:\Program Files\MATLAB\R2012a\toolbox\matlab\polyfun\polyfit.m

Rename your file, C:\Users\pca02\Desktop\Documents\MATLAB\polyfit.m, and run

    p=polyfit(x,y,8);

Best Answer

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MATLAB: It seems thta the function “polyfit” doesn´t work anymore in the Matlab, how can I solve this problem

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