horzcat error Conversion to struct from double is not possible.

??? Error using ==> horzcat

The following error occurred converting from double to struct:

Error using ==> struct

Conversion to struct from double is not possible. Error in ==> svds at 65 B = [sparse(m,m) A; A' sparse(n,n)];

Error in ==> srmsvd at 9 [u,s,v,flag] = svds(A,neigs,'L',opts);

Error in ==> run_srm at 4 srmsvd(datapath,neigs);

code where error is occuring

:

function [U,S,V,flag] = svds(varargin)

A = varargin{1};
[m,n] = size(A);
p = min(m,n);
q = max(m,n);

B = [sparse(m,m) A; A' sparse(n,n)];

srmsvd:

function [] = srmsvd(datapath,neigs)

A = load(datapath)
disp 'data loaded'
disp(['neigs set to ' num2str(neigs)])
opts.issym = 0;
opts.isreal = 1;
opts.disp = 0;
[u,s,v,flag] = svds(A,neigs,'L',opts);

run_srm:

datapath = 'twitter_data.mat'; %path to matlab file with sparse data matrix
neigs = 50; %number of eigenvectors

srmsvd(datapath,neigs);

Answer 1

[Walter Roberson]

The result of

A = load(datapath)

is going to be a struct in which there is one field for every variable loaded from the .mat file. You need to extract the appropriate variable.