Preparation of the release 2.23.1

app/src/main/assets/release_notes.mmt

@@ -4,6 +4,29 @@
     <text_fragment textStyle="subsection">
       <term key="text" text="Current release:" />
     </text_fragment>
+    <text_fragment numbering="true">
+      <term key="text" text='Added "solve" function to find a&#10;root of an one-dimensional equation:' />
+    </text_fragment>
+    <result resultFieldType="real" arrayLength="7">
+      <term key="leftTerm" code="solve">
+        <term key="argTerm" code="sin">
+          <term key="argTerm" code="mult">
+            <term key="leftTerm" text="0.1" />
+            <term key="rightTerm" text="x" />
+          </term>
+        </term>
+        <term key="index" text="x" />
+        <term key="minValue" text="1" />
+        <term key="maxValue" text="50" />
+      </term>
+      <term key="rightTerm" text="" />
+    </result>
+    <text_fragment numbering="true">
+      <term key="text" text="Fixed a bug: F-Droid can't build - AAPT2&#10;error." />
+    </text_fragment>
+    <text_fragment textStyle="subsection">
+      <term key="text" text="Version 2.23.0" />
+    </text_fragment>
     <text_fragment numbering="true">
       <term key="text" text="Added possibility to format a result as&#10;a fraction:" />
     </text_fragment>
@@ -25,7 +48,7 @@
       <term key="text" text="Fixed a bug: an operation with an array&#10;on the top of equation results NaN or&#10;an invalid value." />
     </text_fragment>
     <text_fragment numbering="true">
-      <term key="text" text="Fixed a bug: 3D plot fails whenever&#10;one interval is used twice." />
+      <term key="text" text="Fixed a bug: 3D plot fails whenever one&#10;interval is used twice." />
     </text_fragment>
     <text_fragment numbering="true">
       <term key="text" text="Fixed a bug on Android 12: soft keyboard&#10;disappears when a formula is expanded." />

doc/html/functions_overview.html

@@ -318,8 +318,8 @@ <h4>6 Functions for real numbers</h4>
 argument</p>
 
 <table border = "0" cellspacing="0" cellpadding="0"><tr>
-  <td>$$random \left( 1\right)  = 0.935868$$</td>
-  <td>$$random \left( 10\right)  = 7.23644$$</td>
+  <td>$$random \left( 1\right)  = 0.686012$$</td>
+  <td>$$random \left( 10\right)  = 0.123869$$</td>
 </tr></table><br>
 
 <p>The most negative (closest to negative
@@ -411,7 +411,25 @@ <h4>9 The definite integral of a function</h4>
   <td>$$\displaystyle\int_{-{\pi} / 2}^{0}\displaystyle\int_{2}^{3}{\rho} \cdot G \left( {\varphi},\, {\rho}\right) \, d{\rho}\, d{\varphi} = 5.0$$</td>
 </tr></table><br>
 
-<h4>10 IF-function and logical operators</h4>
+<h4>10 Root finding</h4>
+
+<p>A root of an one-dimensional equation f(x)=0
+using Ridders Method:</p>
+
+<table border = "0" cellspacing="0" cellpadding="0"><tr>
+  <td>$$f(x) := \frac{d}{dx}  \left( {sin \left( x\right) }^{2} + {e}^{sin \left( x\right) }\right) $$</td>
+</tr></table><br>
+
+<table border = "0" cellspacing="0" cellpadding="0"><tr>
+  <td>$$r := solve \left( f \left( y\right) ,\, y,\, -5,\, 5\right) $$</td>
+</tr></table><br>
+
+<table border = "0" cellspacing="0" cellpadding="0"><tr>
+  <td>$$r = 4.71239$$</td>
+  <td>$$f \left( r\right)  = -2.54529E-9$$</td>
+</tr></table><br>
+
+<h4>11 IF-function and logical operators</h4>
 
 <p>Select a term to be used depending on
 comparison result for two expressions</p>
@@ -453,7 +471,7 @@ <h4>10 IF-function and logical operators</h4>
   <td>$$if \left( \left( 1 = 2 \right) and \left( 1 \neq 2 \right),\, true,\, false\right)  = 0.0$$</td>
 </tr></table><br>
 
-<h4>11 Function plots</h4>
+<h4>12 Function plots</h4>
 
 <table border = "0" cellspacing="0" cellpadding="0"><tr>
   <td>The first x-value:</td>
@@ -495,7 +513,7 @@ <h4>11 Function plots</h4>
   <td><img src="functions_overview_fig2.png"alt="Image"></td>
 </tr></table><br>
 
-<h4>12 Arrays</h4>
+<h4>13 Arrays</h4>
 
 <p>Define index range</p>
 
@@ -554,7 +572,7 @@ <h4>12 Arrays</h4>
   <td>$$E = \begin{bmatrix}1.0&0.0&0.0\\0.0&1.0&0.0\\0.0&0.0&1.0\\\end{bmatrix}$$</td>
 </tr></table><br>
 
-<h4>13 Signal processing</h4>
+<h4>14 Signal processing</h4>
 
 <p>Read a matrix fom an ASCII CSV file: </p>
 
@@ -611,12 +629,12 @@ <h4>13 Signal processing</h4>
   <td><img src="functions_overview_fig5.png"alt="Image"></td>
 </tr></table><br>
 
-<h4>14 Output format</h4>
+<h4>15 Output format</h4>
 
 <p>Using result property dialog, it is possible
 to change the format of the result field: </p>
 
-<p>14.1 Radix</p>
+<p>15.1 Radix</p>
 
 <p>Use a radix for integer results, for example
 use binary, octal or hexadecimal bases:</p>
@@ -631,7 +649,7 @@ <h4>14 Output format</h4>
   <td>$$M = fe$$</td>
 </tr></table><br>
 
-<p>14.1 Fraction</p>
+<p>15.1 Fraction</p>
 
 <p>Show a fraction for the floating results:</p>
 

fastlane/metadata/android/en-US/changelogs/323.txt

@@ -0,0 +1,2 @@
+• Added "solve" function to find a root of an one-dimensional equation.
+• Fixed a bug: F-Droid can't build - AAPT2 error.

fastlane/metadata/android/en-US/full_description.txt

@@ -22,7 +22,8 @@ Benefits and features:
 * The app contains detailed "How to use" page and several examples
 * Supports different color themes
 * Supports data import from ASCII files
+* Supports units of measurements, arrays, complex numbers, functions of many arguments, plots for several functions, contour and 3D plots, summation and product operations, derivative and definite integrals, if-function and logical operators, Fourier transform, root finding.
 
-The microMathematics Plus has exactly the same user interface as the microMathematics free version, but implements more mathematical functionality: units of measurements, arrays, complex numbers, functions of many arguments, plots for several functions, contour and 3D plots, summation and product operations, derivative and definite integrals, if-function and logical operators. This version has following mathematical limitations: it does not support special functions, vectors, matrices and many other things from high-level mathematics.
+This version has following mathematical limitations: it does not support special functions, vectors, matrices and many other things from high-level mathematics.
 
 Languages: English, Russian, German, Brazilian Portuguese, Chinese, Spanish