vb_repmultiply   

PURPOSE

SYNOPSIS

DESCRIPTION

 MEX function to multiply a vector with a matrix without repmat 
 Much faster than using repmat and no need to memory allocation
 --- Usage
 z = vb_repmultiply(x,y)
 x : M x N
 z : M x N

 case  y : 1 x N
  z = x .* repmat(y, [M 1])
    = x * diag(y)
  z(m,n) = x(m,n) * y(n)

 case  y : M x 1
  z = x .* repmat(y, [1 N])
    = diag(y) * x
  z(m,n) = x(m,n) * y(m)

 case  y : 1 x 1
  z = x * y
  z(m,n) = x(m,n) * y

 Copyright (C) 2011, ATR All Rights Reserved.
 License : New BSD License(see VBMEG_LICENSE.txt)

CROSS-REFERENCE INFORMATION

• vb_surf_smooth smoothing surface by spring model
• vb_affine_trans_for_fit Affine transformation matrix to fit X to Y
• vb_calc_spectrum Calculate spectrum
• vb_temporal_pca Temporal PCA
• vb_ykgwfile_load_meg_channel_info load and return channel information like as sensor coordinate, setting loaded
• vb_emg_spectral_check Check EMG frequency spectrum
• vb_get_trigger_multi Find event onset time points for 'multi' channel bit pattern
• calc_kalman_gain
• vb_calc_current Current reconstruction using Bayesian inverse filter
• vb_current_reconstruct_z Current reconstruction using Bayesian inverse filter.
• vb_current_reconstruct_z_tr Current reconstruction using Bayesian inverse filter.
• vb_feature_calc Calculate bandpass power of estimated current
• vb_invfilter_z Inverse filter for Z-current reconstruction
• vbmeg_ard_estimate4 Variational Bayes estimation for MEG.
• vbmeg_current_calc_z Current reconstruction using Bayesian inverse filter
• vbmeg_current_filter_z Calculate Hierarchical Bayesian inverse filter
• vbmeg_current_reconstruct_z Current reconstruction using Bayesian inverse filter.
• vbmeg_current_reconstruct_z_tr Current reconstruction using Bayesian inverse filter.
• vbmeg_feature_calc_z Current reconstruction using Bayesian inverse filter
• vb_job_reject_channels_trials_gui Find bad channel/trials based on maximum amplitude and 1st differece
• vb_job_bad_trial Find bad channel/trials by checking max value in each channel/trial
• vb_bem_inverse_eeg transform matrix to map dipole potencial to EEG potencial
• cmap_add add two colormap
• make_orthogonal_vec make orthogonal vector to dX in 3D space
• make_orthogonal_vec_old make orthogonal vector to dX in 3D space
• plot_cylinder_anime p : Plot parameter
• vb_current_reconstruct_z_meeg Current reconstruction using Bayesian inverse filter.
• vb_current_reconstruct_z_tr_meeg Current reconstruction using Bayesian inverse filter.
• vbmeg_current_filter_z_meeg Calculate Hierarchical Bayesian inverse filter for MEG+EEG
• neuro_head_to_spm_right Change Neuromag-Head coordinate to Right-hand SPM [m] coordinate
• spm_right_to_neuro_vox Change Neuromag-Head coordinate to Right-hand SPM [m] coordinate

SOURCE CODE

0001 function    z = vb_repmultiply(x,y)
0002 % MEX function to multiply a vector with a matrix without repmat
0003 % Much faster than using repmat and no need to memory allocation
0004 % --- Usage
0005 % z = vb_repmultiply(x,y)
0006 % x : M x N
0007 % z : M x N
0008 %
0009 % case  y : 1 x N
0010 %  z = x .* repmat(y, [M 1])
0011 %    = x * diag(y)
0012 %  z(m,n) = x(m,n) * y(n)
0013 %
0014 % case  y : M x 1
0015 %  z = x .* repmat(y, [1 N])
0016 %    = diag(y) * x
0017 %  z(m,n) = x(m,n) * y(m)
0018 %
0019 % case  y : 1 x 1
0020 %  z = x * y
0021 %  z(m,n) = x(m,n) * y
0022 %
0023 % Copyright (C) 2011, ATR All Rights Reserved.
0024 % License : New BSD License(see VBMEG_LICENSE.txt)