title: reading gctx file in R
body: <p>I am trying to read a gctx file extracted from LINCS source for gene expression analysis. The codes for eading the file are provided at the link below.
  <a href="https://github.com/cmap/l1ktools" rel="nofollow noreferrer">https://github.com/cmap/l1ktools</a>.
  I am using the script provided and I have sourced the script. however when I tried the function <code>parse.gctx</code> it gives me following error:</p>
  
  <pre><code>ds &lt;- parse.gctx("../L1000 Data/zspc_n40172x22268.gctx")
  
  reading ../L1000 Data/zspc_n40172x22268.gctx
  Error in h5checktypeOrOpenLoc(file, readonly = TRUE) : 
    Error in h5checktypeOrOpenLoc(). Cannot open file. File 'C:\L1000 Data\zspc_n40172x22268.gctx' does not exist.
  </code></pre>
  
  <p>How can I resolve this issue and read my gctx file?</p>