matlab code for mean_squared_error

oob_mse = mean_squared_error(y_train, predict(rf_classifier, X_train));

I need matlab code for mean_squared_error.

Please provide me.

Thanks.

Sanchit

[Sanchit]

Brace indexing into the result of a function call is not supported. Assign the result of 'immse' to a

variable first, then brace index into it.

Error in sample (line 17)

oob_mse = immse{y_train, predict(rf_classifier, X_train)};

Please suggest me how to fix this error.

Thanks for your help.

Sanchit

[Walter Roberson]

oob_mse = immse(y_train, predict(rf_classifier, X_train));

[Sanchit]

Error using immse

Expected input number 1, A, to be one of these types:

uint8, int8, uint16, int16, uint32, int32, single, double

Instead its type was table.

Error in immse (line 28)

validateattributes(x,{'uint8', 'int8', 'uint16', 'int16', 'uint32', 'int32', ...

Error in sample (line 17)

oob_mse = immse(y_train, predict(rf_classifier, X_train));

How to convert table into number array?

Sanchit

[Walter Roberson]

I already showed you, https://www.mathworks.com/matlabcentral/answers/1993558-i-am-attaching-the-matlab-code-and-input-file-and-request-to-make-it-workable#answer_1269743

Answer 1

[Walter Roberson]

oob_mse = rmse(predict(rf_classifier, X_train), y_train);

... as I discussed in one of your other postings.

[Sanchit]

Error using matlab.internal.math.parseErrorMetricsInput

Invalid data type. First and second arguments must be double or single arrays.

Error in rmse (line 46)

matlab.internal.math.parseErrorMetricsInput(false,F,A,varargin{:});

Error in sample (line 18)

oob_mse = rmse(predict(rf_classifier, X_train), y_train);

Please suggest me how to fix it.

Sanchit

[Walter Roberson]

You are continuing to use tables for your training data. I showed you in https://www.mathworks.com/matlabcentral/answers/1993558-i-am-attaching-the-matlab-code-and-input-file-and-request-to-make-it-workable#answer_1269743 how to assign to X and y to avoid those problems.

Answer 2

[Prasannavenkatesh]

Hi Sanchit,

You can use the existing immse function in matlab (https://in.mathworks.com/help/images/ref/immse.html) for calculating the mean squared error. Hope this helps.

[Sanchit]

Brace indexing into the result of a function call is not supported. Assign the result of 'immse' to a

variable first, then brace index into it.

Error in sample (line 17)

oob_mse = immse{y_train, predict(rf_classifier, X_train)};

Please suggest me how to fix this error.

Thanks for your help.

Sanchit

[Walter Roberson]

oob_mse = immse(y_train, predict(rf_classifier, X_train));