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FDC help: NUM2STR2
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The utility <i>NUM2STR2</i>
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<p><i>NUM2STR2</i> convers numbers to strings. Contrary to the Matlab routine <i>NUM2STR</i>, this utility makes it possible to specify the number of characters for the string representation.</p>
<h3>Usage</h3>
<p><code>T = num2str2(X,C)</code> returns a string <i>T</i> with <i>C</i> characters. In general, the number of decimal places will be equal to <i>C</i> - 2 (= number of characters minus space reserved for possible signs or decimal points). If a number does not fit, it is rounded to a value which does fit in <i>C</i> characters. If the number of characters is not specified, as in: <code>T = NUM2STR2(X)</code>, the return-string <i>T</i> will automatically be set-up with 6 characters. Leading spaces will be used for numbers requiring less than <i>C</i> characters.</p>
<p>If necessary, an exponent will be created, still within the reserved space of <i>C</i> characters. In that case the number of decimal places will be reduced (an exponent typically takes four characters, e.g. 'E+25').</p>
<p><b>Note:</b> values of C smaller than 6 are not accepted and automatically converted to <i>C</i> = 6! This prevents problems that may occur when trying to show very large numbers in too few characters. However, you may still encounter strange results if you reserve a very small space for large numbers.</p>
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